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Message-ID: <202106262126.An2i4ZxC-lkp@intel.com>
Date: Sat, 26 Jun 2021 21:26:41 +0800
From: kernel test robot <lkp@...el.com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: kbuild-all@...ts.01.org, clang-built-linux@...glegroups.com,
linux-kernel@...r.kernel.org,
Valentin Schneider <valentin.schneider@....com>
Subject: mm/vmscan.c:1071:21: warning: stack frame size (2064) exceeds limit
(2048) in function 'shrink_page_list'
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: b7050b242430f3170e0b57f5f55136e44cb8dc66
commit: b02a4fd8148f655095d9e3d6eddd8f0042bcc27c cpumask: Make cpu_{online,possible,present,active}() inline
date: 2 months ago
config: powerpc-randconfig-r034-20210626 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 557b101ce714e39438ba1d39c4c50b03e12fcb96)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# install powerpc cross compiling tool for clang build
# apt-get install binutils-powerpc-linux-gnu
# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b02a4fd8148f655095d9e3d6eddd8f0042bcc27c
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout b02a4fd8148f655095d9e3d6eddd8f0042bcc27c
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>
All warnings (new ones prefixed by >>):
In file included from mm/vmscan.c:19:
In file included from include/linux/kernel_stat.h:9:
In file included from include/linux/interrupt.h:11:
In file included from include/linux/hardirq.h:10:
In file included from arch/powerpc/include/asm/hardirq.h:6:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:13:
In file included from arch/powerpc/include/asm/io.h:619:
arch/powerpc/include/asm/io-defs.h:45:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
DEF_PCI_AC_NORET(insw, (unsigned long p, void *b, unsigned long c),
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/powerpc/include/asm/io.h:616:3: note: expanded from macro 'DEF_PCI_AC_NORET'
__do_##name al; \
^~~~~~~~~~~~~~
<scratch space>:186:1: note: expanded from here
__do_insw
^
arch/powerpc/include/asm/io.h:557:56: note: expanded from macro '__do_insw'
#define __do_insw(p, b, n) readsw((PCI_IO_ADDR)_IO_BASE+(p), (b), (n))
~~~~~~~~~~~~~~~~~~~~~^
In file included from mm/vmscan.c:19:
In file included from include/linux/kernel_stat.h:9:
In file included from include/linux/interrupt.h:11:
In file included from include/linux/hardirq.h:10:
In file included from arch/powerpc/include/asm/hardirq.h:6:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:13:
In file included from arch/powerpc/include/asm/io.h:619:
arch/powerpc/include/asm/io-defs.h:47:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
DEF_PCI_AC_NORET(insl, (unsigned long p, void *b, unsigned long c),
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/powerpc/include/asm/io.h:616:3: note: expanded from macro 'DEF_PCI_AC_NORET'
__do_##name al; \
^~~~~~~~~~~~~~
<scratch space>:190:1: note: expanded from here
__do_insl
^
arch/powerpc/include/asm/io.h:558:56: note: expanded from macro '__do_insl'
#define __do_insl(p, b, n) readsl((PCI_IO_ADDR)_IO_BASE+(p), (b), (n))
~~~~~~~~~~~~~~~~~~~~~^
In file included from mm/vmscan.c:19:
In file included from include/linux/kernel_stat.h:9:
In file included from include/linux/interrupt.h:11:
In file included from include/linux/hardirq.h:10:
In file included from arch/powerpc/include/asm/hardirq.h:6:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:13:
In file included from arch/powerpc/include/asm/io.h:619:
arch/powerpc/include/asm/io-defs.h:49:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
DEF_PCI_AC_NORET(outsb, (unsigned long p, const void *b, unsigned long c),
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/powerpc/include/asm/io.h:616:3: note: expanded from macro 'DEF_PCI_AC_NORET'
__do_##name al; \
^~~~~~~~~~~~~~
<scratch space>:194:1: note: expanded from here
__do_outsb
^
arch/powerpc/include/asm/io.h:559:58: note: expanded from macro '__do_outsb'
#define __do_outsb(p, b, n) writesb((PCI_IO_ADDR)_IO_BASE+(p),(b),(n))
~~~~~~~~~~~~~~~~~~~~~^
In file included from mm/vmscan.c:19:
In file included from include/linux/kernel_stat.h:9:
In file included from include/linux/interrupt.h:11:
In file included from include/linux/hardirq.h:10:
In file included from arch/powerpc/include/asm/hardirq.h:6:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:13:
In file included from arch/powerpc/include/asm/io.h:619:
arch/powerpc/include/asm/io-defs.h:51:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
DEF_PCI_AC_NORET(outsw, (unsigned long p, const void *b, unsigned long c),
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/powerpc/include/asm/io.h:616:3: note: expanded from macro 'DEF_PCI_AC_NORET'
__do_##name al; \
^~~~~~~~~~~~~~
<scratch space>:198:1: note: expanded from here
__do_outsw
^
arch/powerpc/include/asm/io.h:560:58: note: expanded from macro '__do_outsw'
#define __do_outsw(p, b, n) writesw((PCI_IO_ADDR)_IO_BASE+(p),(b),(n))
~~~~~~~~~~~~~~~~~~~~~^
In file included from mm/vmscan.c:19:
In file included from include/linux/kernel_stat.h:9:
In file included from include/linux/interrupt.h:11:
In file included from include/linux/hardirq.h:10:
In file included from arch/powerpc/include/asm/hardirq.h:6:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:13:
In file included from arch/powerpc/include/asm/io.h:619:
arch/powerpc/include/asm/io-defs.h:53:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
DEF_PCI_AC_NORET(outsl, (unsigned long p, const void *b, unsigned long c),
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/powerpc/include/asm/io.h:616:3: note: expanded from macro 'DEF_PCI_AC_NORET'
__do_##name al; \
^~~~~~~~~~~~~~
<scratch space>:202:1: note: expanded from here
__do_outsl
^
arch/powerpc/include/asm/io.h:561:58: note: expanded from macro '__do_outsl'
#define __do_outsl(p, b, n) writesl((PCI_IO_ADDR)_IO_BASE+(p),(b),(n))
~~~~~~~~~~~~~~~~~~~~~^
>> mm/vmscan.c:1071:21: warning: stack frame size (2064) exceeds limit (2048) in function 'shrink_page_list' [-Wframe-larger-than]
static unsigned int shrink_page_list(struct list_head *page_list,
^
14 warnings generated.
vim +/shrink_page_list +1071 mm/vmscan.c
e2be15f6c3eece Mel Gorman 2013-07-03 1067
^1da177e4c3f41 Linus Torvalds 2005-04-16 1068 /*
1742f19fa920cd Andrew Morton 2006-03-22 1069 * shrink_page_list() returns the number of reclaimed pages
^1da177e4c3f41 Linus Torvalds 2005-04-16 1070 */
730ec8c01a2bd6 Maninder Singh 2020-06-03 @1071 static unsigned int shrink_page_list(struct list_head *page_list,
599d0c954f91d0 Mel Gorman 2016-07-28 1072 struct pglist_data *pgdat,
f84f6e2b0868f1 Mel Gorman 2011-10-31 1073 struct scan_control *sc,
3c710c1ad11b4a Michal Hocko 2017-02-22 1074 struct reclaim_stat *stat,
8940b34a4e082a Minchan Kim 2019-09-25 1075 bool ignore_references)
^1da177e4c3f41 Linus Torvalds 2005-04-16 1076 {
^1da177e4c3f41 Linus Torvalds 2005-04-16 1077 LIST_HEAD(ret_pages);
abe4c3b50c3f25 Mel Gorman 2010-08-09 1078 LIST_HEAD(free_pages);
730ec8c01a2bd6 Maninder Singh 2020-06-03 1079 unsigned int nr_reclaimed = 0;
730ec8c01a2bd6 Maninder Singh 2020-06-03 1080 unsigned int pgactivate = 0;
^1da177e4c3f41 Linus Torvalds 2005-04-16 1081
060f005f074791 Kirill Tkhai 2019-03-05 1082 memset(stat, 0, sizeof(*stat));
^1da177e4c3f41 Linus Torvalds 2005-04-16 1083 cond_resched();
^1da177e4c3f41 Linus Torvalds 2005-04-16 1084
^1da177e4c3f41 Linus Torvalds 2005-04-16 1085 while (!list_empty(page_list)) {
^1da177e4c3f41 Linus Torvalds 2005-04-16 1086 struct address_space *mapping;
^1da177e4c3f41 Linus Torvalds 2005-04-16 1087 struct page *page;
8940b34a4e082a Minchan Kim 2019-09-25 1088 enum page_references references = PAGEREF_RECLAIM;
4b793062674707 Kirill Tkhai 2020-04-01 1089 bool dirty, writeback, may_enter_fs;
98879b3b9edc16 Yang Shi 2019-07-11 1090 unsigned int nr_pages;
^1da177e4c3f41 Linus Torvalds 2005-04-16 1091
^1da177e4c3f41 Linus Torvalds 2005-04-16 1092 cond_resched();
^1da177e4c3f41 Linus Torvalds 2005-04-16 1093
^1da177e4c3f41 Linus Torvalds 2005-04-16 1094 page = lru_to_page(page_list);
^1da177e4c3f41 Linus Torvalds 2005-04-16 1095 list_del(&page->lru);
^1da177e4c3f41 Linus Torvalds 2005-04-16 1096
529ae9aaa08378 Nick Piggin 2008-08-02 1097 if (!trylock_page(page))
^1da177e4c3f41 Linus Torvalds 2005-04-16 1098 goto keep;
^1da177e4c3f41 Linus Torvalds 2005-04-16 1099
309381feaee564 Sasha Levin 2014-01-23 1100 VM_BUG_ON_PAGE(PageActive(page), page);
^1da177e4c3f41 Linus Torvalds 2005-04-16 1101
d8c6546b1aea84 Matthew Wilcox (Oracle 2019-09-23 1102) nr_pages = compound_nr(page);
98879b3b9edc16 Yang Shi 2019-07-11 1103
98879b3b9edc16 Yang Shi 2019-07-11 1104 /* Account the number of base pages even though THP */
98879b3b9edc16 Yang Shi 2019-07-11 1105 sc->nr_scanned += nr_pages;
80e4342601abfa Christoph Lameter 2006-02-11 1106
39b5f29ac1f988 Hugh Dickins 2012-10-08 1107 if (unlikely(!page_evictable(page)))
ad6b67041a4549 Minchan Kim 2017-05-03 1108 goto activate_locked;
894bc310419ac9 Lee Schermerhorn 2008-10-18 1109
a6dc60f8975ad9 Johannes Weiner 2009-03-31 1110 if (!sc->may_unmap && page_mapped(page))
80e4342601abfa Christoph Lameter 2006-02-11 1111 goto keep_locked;
80e4342601abfa Christoph Lameter 2006-02-11 1112
c661b078fd62ab Andy Whitcroft 2007-08-22 1113 may_enter_fs = (sc->gfp_mask & __GFP_FS) ||
c661b078fd62ab Andy Whitcroft 2007-08-22 1114 (PageSwapCache(page) && (sc->gfp_mask & __GFP_IO));
c661b078fd62ab Andy Whitcroft 2007-08-22 1115
e2be15f6c3eece Mel Gorman 2013-07-03 1116 /*
894befec4d70b1 Andrey Ryabinin 2018-04-10 1117 * The number of dirty pages determines if a node is marked
e2be15f6c3eece Mel Gorman 2013-07-03 1118 * reclaim_congested which affects wait_iff_congested. kswapd
e2be15f6c3eece Mel Gorman 2013-07-03 1119 * will stall and start writing pages if the tail of the LRU
e2be15f6c3eece Mel Gorman 2013-07-03 1120 * is all dirty unqueued pages.
e2be15f6c3eece Mel Gorman 2013-07-03 1121 */
e2be15f6c3eece Mel Gorman 2013-07-03 1122 page_check_dirty_writeback(page, &dirty, &writeback);
e2be15f6c3eece Mel Gorman 2013-07-03 1123 if (dirty || writeback)
060f005f074791 Kirill Tkhai 2019-03-05 1124 stat->nr_dirty++;
e2be15f6c3eece Mel Gorman 2013-07-03 1125
e2be15f6c3eece Mel Gorman 2013-07-03 1126 if (dirty && !writeback)
060f005f074791 Kirill Tkhai 2019-03-05 1127 stat->nr_unqueued_dirty++;
e2be15f6c3eece Mel Gorman 2013-07-03 1128
d04e8acd03e5c3 Mel Gorman 2013-07-03 1129 /*
d04e8acd03e5c3 Mel Gorman 2013-07-03 1130 * Treat this page as congested if the underlying BDI is or if
d04e8acd03e5c3 Mel Gorman 2013-07-03 1131 * pages are cycling through the LRU so quickly that the
d04e8acd03e5c3 Mel Gorman 2013-07-03 1132 * pages marked for immediate reclaim are making it to the
d04e8acd03e5c3 Mel Gorman 2013-07-03 1133 * end of the LRU a second time.
d04e8acd03e5c3 Mel Gorman 2013-07-03 1134 */
e2be15f6c3eece Mel Gorman 2013-07-03 1135 mapping = page_mapping(page);
1da58ee2a0279a Jamie Liu 2014-12-10 1136 if (((dirty || writeback) && mapping &&
703c270887bb51 Tejun Heo 2015-05-22 1137 inode_write_congested(mapping->host)) ||
d04e8acd03e5c3 Mel Gorman 2013-07-03 1138 (writeback && PageReclaim(page)))
060f005f074791 Kirill Tkhai 2019-03-05 1139 stat->nr_congested++;
e2be15f6c3eece Mel Gorman 2013-07-03 1140
e62e384e9da8d9 Michal Hocko 2012-07-31 1141 /*
283aba9f9e0e48 Mel Gorman 2013-07-03 1142 * If a page at the tail of the LRU is under writeback, there
283aba9f9e0e48 Mel Gorman 2013-07-03 1143 * are three cases to consider.
283aba9f9e0e48 Mel Gorman 2013-07-03 1144 *
283aba9f9e0e48 Mel Gorman 2013-07-03 1145 * 1) If reclaim is encountering an excessive number of pages
283aba9f9e0e48 Mel Gorman 2013-07-03 1146 * under writeback and this page is both under writeback and
283aba9f9e0e48 Mel Gorman 2013-07-03 1147 * PageReclaim then it indicates that pages are being queued
283aba9f9e0e48 Mel Gorman 2013-07-03 1148 * for IO but are being recycled through the LRU before the
283aba9f9e0e48 Mel Gorman 2013-07-03 1149 * IO can complete. Waiting on the page itself risks an
283aba9f9e0e48 Mel Gorman 2013-07-03 1150 * indefinite stall if it is impossible to writeback the
283aba9f9e0e48 Mel Gorman 2013-07-03 1151 * page due to IO error or disconnected storage so instead
b1a6f21e3b2315 Mel Gorman 2013-07-03 1152 * note that the LRU is being scanned too quickly and the
b1a6f21e3b2315 Mel Gorman 2013-07-03 1153 * caller can stall after page list has been processed.
283aba9f9e0e48 Mel Gorman 2013-07-03 1154 *
97c9341f727105 Tejun Heo 2015-05-22 1155 * 2) Global or new memcg reclaim encounters a page that is
ecf5fc6e9654cd Michal Hocko 2015-08-04 1156 * not marked for immediate reclaim, or the caller does not
ecf5fc6e9654cd Michal Hocko 2015-08-04 1157 * have __GFP_FS (or __GFP_IO if it's simply going to swap,
ecf5fc6e9654cd Michal Hocko 2015-08-04 1158 * not to fs). In this case mark the page for immediate
97c9341f727105 Tejun Heo 2015-05-22 1159 * reclaim and continue scanning.
283aba9f9e0e48 Mel Gorman 2013-07-03 1160 *
ecf5fc6e9654cd Michal Hocko 2015-08-04 1161 * Require may_enter_fs because we would wait on fs, which
ecf5fc6e9654cd Michal Hocko 2015-08-04 1162 * may not have submitted IO yet. And the loop driver might
283aba9f9e0e48 Mel Gorman 2013-07-03 1163 * enter reclaim, and deadlock if it waits on a page for
283aba9f9e0e48 Mel Gorman 2013-07-03 1164 * which it is needed to do the write (loop masks off
283aba9f9e0e48 Mel Gorman 2013-07-03 1165 * __GFP_IO|__GFP_FS for this reason); but more thought
283aba9f9e0e48 Mel Gorman 2013-07-03 1166 * would probably show more reasons.
283aba9f9e0e48 Mel Gorman 2013-07-03 1167 *
7fadc820222497 Hugh Dickins 2015-09-08 1168 * 3) Legacy memcg encounters a page that is already marked
283aba9f9e0e48 Mel Gorman 2013-07-03 1169 * PageReclaim. memcg does not have any dirty pages
283aba9f9e0e48 Mel Gorman 2013-07-03 1170 * throttling so we could easily OOM just because too many
283aba9f9e0e48 Mel Gorman 2013-07-03 1171 * pages are in writeback and there is nothing else to
283aba9f9e0e48 Mel Gorman 2013-07-03 1172 * reclaim. Wait for the writeback to complete.
c55e8d035b28b2 Johannes Weiner 2017-02-24 1173 *
c55e8d035b28b2 Johannes Weiner 2017-02-24 1174 * In cases 1) and 2) we activate the pages to get them out of
c55e8d035b28b2 Johannes Weiner 2017-02-24 1175 * the way while we continue scanning for clean pages on the
c55e8d035b28b2 Johannes Weiner 2017-02-24 1176 * inactive list and refilling from the active list. The
c55e8d035b28b2 Johannes Weiner 2017-02-24 1177 * observation here is that waiting for disk writes is more
c55e8d035b28b2 Johannes Weiner 2017-02-24 1178 * expensive than potentially causing reloads down the line.
c55e8d035b28b2 Johannes Weiner 2017-02-24 1179 * Since they're marked for immediate reclaim, they won't put
c55e8d035b28b2 Johannes Weiner 2017-02-24 1180 * memory pressure on the cache working set any longer than it
c55e8d035b28b2 Johannes Weiner 2017-02-24 1181 * takes to write them to disk.
e62e384e9da8d9 Michal Hocko 2012-07-31 1182 */
283aba9f9e0e48 Mel Gorman 2013-07-03 1183 if (PageWriteback(page)) {
283aba9f9e0e48 Mel Gorman 2013-07-03 1184 /* Case 1 above */
283aba9f9e0e48 Mel Gorman 2013-07-03 1185 if (current_is_kswapd() &&
283aba9f9e0e48 Mel Gorman 2013-07-03 1186 PageReclaim(page) &&
599d0c954f91d0 Mel Gorman 2016-07-28 1187 test_bit(PGDAT_WRITEBACK, &pgdat->flags)) {
060f005f074791 Kirill Tkhai 2019-03-05 1188 stat->nr_immediate++;
c55e8d035b28b2 Johannes Weiner 2017-02-24 1189 goto activate_locked;
283aba9f9e0e48 Mel Gorman 2013-07-03 1190
283aba9f9e0e48 Mel Gorman 2013-07-03 1191 /* Case 2 above */
b5ead35e7e1d34 Johannes Weiner 2019-11-30 1192 } else if (writeback_throttling_sane(sc) ||
ecf5fc6e9654cd Michal Hocko 2015-08-04 1193 !PageReclaim(page) || !may_enter_fs) {
c3b94f44fcb072 Hugh Dickins 2012-07-31 1194 /*
c3b94f44fcb072 Hugh Dickins 2012-07-31 1195 * This is slightly racy - end_page_writeback()
c3b94f44fcb072 Hugh Dickins 2012-07-31 1196 * might have just cleared PageReclaim, then
c3b94f44fcb072 Hugh Dickins 2012-07-31 1197 * setting PageReclaim here end up interpreted
c3b94f44fcb072 Hugh Dickins 2012-07-31 1198 * as PageReadahead - but that does not matter
c3b94f44fcb072 Hugh Dickins 2012-07-31 1199 * enough to care. What we do want is for this
c3b94f44fcb072 Hugh Dickins 2012-07-31 1200 * page to have PageReclaim set next time memcg
c3b94f44fcb072 Hugh Dickins 2012-07-31 1201 * reclaim reaches the tests above, so it will
c3b94f44fcb072 Hugh Dickins 2012-07-31 1202 * then wait_on_page_writeback() to avoid OOM;
c3b94f44fcb072 Hugh Dickins 2012-07-31 1203 * and it's also appropriate in global reclaim.
c3b94f44fcb072 Hugh Dickins 2012-07-31 1204 */
c3b94f44fcb072 Hugh Dickins 2012-07-31 1205 SetPageReclaim(page);
060f005f074791 Kirill Tkhai 2019-03-05 1206 stat->nr_writeback++;
c55e8d035b28b2 Johannes Weiner 2017-02-24 1207 goto activate_locked;
283aba9f9e0e48 Mel Gorman 2013-07-03 1208
283aba9f9e0e48 Mel Gorman 2013-07-03 1209 /* Case 3 above */
283aba9f9e0e48 Mel Gorman 2013-07-03 1210 } else {
7fadc820222497 Hugh Dickins 2015-09-08 1211 unlock_page(page);
c3b94f44fcb072 Hugh Dickins 2012-07-31 1212 wait_on_page_writeback(page);
7fadc820222497 Hugh Dickins 2015-09-08 1213 /* then go back and try same page again */
7fadc820222497 Hugh Dickins 2015-09-08 1214 list_add_tail(&page->lru, page_list);
7fadc820222497 Hugh Dickins 2015-09-08 1215 continue;
e62e384e9da8d9 Michal Hocko 2012-07-31 1216 }
283aba9f9e0e48 Mel Gorman 2013-07-03 1217 }
^1da177e4c3f41 Linus Torvalds 2005-04-16 1218
8940b34a4e082a Minchan Kim 2019-09-25 1219 if (!ignore_references)
6a18adb35c2784 Konstantin Khlebnikov 2012-05-29 1220 references = page_check_references(page, sc);
02c6de8d757cb3 Minchan Kim 2012-10-08 1221
dfc8d636cdb95f Johannes Weiner 2010-03-05 1222 switch (references) {
dfc8d636cdb95f Johannes Weiner 2010-03-05 1223 case PAGEREF_ACTIVATE:
^1da177e4c3f41 Linus Torvalds 2005-04-16 1224 goto activate_locked;
645747462435d8 Johannes Weiner 2010-03-05 1225 case PAGEREF_KEEP:
98879b3b9edc16 Yang Shi 2019-07-11 1226 stat->nr_ref_keep += nr_pages;
645747462435d8 Johannes Weiner 2010-03-05 1227 goto keep_locked;
dfc8d636cdb95f Johannes Weiner 2010-03-05 1228 case PAGEREF_RECLAIM:
dfc8d636cdb95f Johannes Weiner 2010-03-05 1229 case PAGEREF_RECLAIM_CLEAN:
dfc8d636cdb95f Johannes Weiner 2010-03-05 1230 ; /* try to reclaim the page below */
dfc8d636cdb95f Johannes Weiner 2010-03-05 1231 }
^1da177e4c3f41 Linus Torvalds 2005-04-16 1232
^1da177e4c3f41 Linus Torvalds 2005-04-16 1233 /*
^1da177e4c3f41 Linus Torvalds 2005-04-16 1234 * Anonymous process memory has backing store?
^1da177e4c3f41 Linus Torvalds 2005-04-16 1235 * Try to allocate it some swap space here.
802a3a92ad7ac0 Shaohua Li 2017-05-03 1236 * Lazyfree page could be freed directly
^1da177e4c3f41 Linus Torvalds 2005-04-16 1237 */
bd4c82c22c367e Huang Ying 2017-09-06 1238 if (PageAnon(page) && PageSwapBacked(page)) {
bd4c82c22c367e Huang Ying 2017-09-06 1239 if (!PageSwapCache(page)) {
63eb6b93ce725e Hugh Dickins 2008-11-19 1240 if (!(sc->gfp_mask & __GFP_IO))
63eb6b93ce725e Hugh Dickins 2008-11-19 1241 goto keep_locked;
feb889fb40fafc Linus Torvalds 2021-01-16 1242 if (page_maybe_dma_pinned(page))
feb889fb40fafc Linus Torvalds 2021-01-16 1243 goto keep_locked;
747552b1e71b40 Huang Ying 2017-07-06 1244 if (PageTransHuge(page)) {
b8f593cd0896b8 Huang Ying 2017-07-06 1245 /* cannot split THP, skip it */
747552b1e71b40 Huang Ying 2017-07-06 1246 if (!can_split_huge_page(page, NULL))
b8f593cd0896b8 Huang Ying 2017-07-06 1247 goto activate_locked;
747552b1e71b40 Huang Ying 2017-07-06 1248 /*
747552b1e71b40 Huang Ying 2017-07-06 1249 * Split pages without a PMD map right
747552b1e71b40 Huang Ying 2017-07-06 1250 * away. Chances are some or all of the
747552b1e71b40 Huang Ying 2017-07-06 1251 * tail pages can be freed without IO.
747552b1e71b40 Huang Ying 2017-07-06 1252 */
747552b1e71b40 Huang Ying 2017-07-06 1253 if (!compound_mapcount(page) &&
bd4c82c22c367e Huang Ying 2017-09-06 1254 split_huge_page_to_list(page,
bd4c82c22c367e Huang Ying 2017-09-06 1255 page_list))
747552b1e71b40 Huang Ying 2017-07-06 1256 goto activate_locked;
747552b1e71b40 Huang Ying 2017-07-06 1257 }
0f0746589e4be0 Minchan Kim 2017-07-06 1258 if (!add_to_swap(page)) {
0f0746589e4be0 Minchan Kim 2017-07-06 1259 if (!PageTransHuge(page))
98879b3b9edc16 Yang Shi 2019-07-11 1260 goto activate_locked_split;
bd4c82c22c367e Huang Ying 2017-09-06 1261 /* Fallback to swap normal pages */
bd4c82c22c367e Huang Ying 2017-09-06 1262 if (split_huge_page_to_list(page,
bd4c82c22c367e Huang Ying 2017-09-06 1263 page_list))
0f0746589e4be0 Minchan Kim 2017-07-06 1264 goto activate_locked;
fe490cc0fe9e6e Huang Ying 2017-09-06 1265 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
fe490cc0fe9e6e Huang Ying 2017-09-06 1266 count_vm_event(THP_SWPOUT_FALLBACK);
fe490cc0fe9e6e Huang Ying 2017-09-06 1267 #endif
0f0746589e4be0 Minchan Kim 2017-07-06 1268 if (!add_to_swap(page))
98879b3b9edc16 Yang Shi 2019-07-11 1269 goto activate_locked_split;
0f0746589e4be0 Minchan Kim 2017-07-06 1270 }
0f0746589e4be0 Minchan Kim 2017-07-06 1271
4b793062674707 Kirill Tkhai 2020-04-01 1272 may_enter_fs = true;
^1da177e4c3f41 Linus Torvalds 2005-04-16 1273
e2be15f6c3eece Mel Gorman 2013-07-03 1274 /* Adding to swap updated mapping */
^1da177e4c3f41 Linus Torvalds 2005-04-16 1275 mapping = page_mapping(page);
bd4c82c22c367e Huang Ying 2017-09-06 1276 }
7751b2da6be0b5 Kirill A. Shutemov 2016-07-26 1277 } else if (unlikely(PageTransHuge(page))) {
7751b2da6be0b5 Kirill A. Shutemov 2016-07-26 1278 /* Split file THP */
7751b2da6be0b5 Kirill A. Shutemov 2016-07-26 1279 if (split_huge_page_to_list(page, page_list))
7751b2da6be0b5 Kirill A. Shutemov 2016-07-26 1280 goto keep_locked;
e2be15f6c3eece Mel Gorman 2013-07-03 1281 }
^1da177e4c3f41 Linus Torvalds 2005-04-16 1282
98879b3b9edc16 Yang Shi 2019-07-11 1283 /*
98879b3b9edc16 Yang Shi 2019-07-11 1284 * THP may get split above, need minus tail pages and update
98879b3b9edc16 Yang Shi 2019-07-11 1285 * nr_pages to avoid accounting tail pages twice.
98879b3b9edc16 Yang Shi 2019-07-11 1286 *
98879b3b9edc16 Yang Shi 2019-07-11 1287 * The tail pages that are added into swap cache successfully
98879b3b9edc16 Yang Shi 2019-07-11 1288 * reach here.
98879b3b9edc16 Yang Shi 2019-07-11 1289 */
98879b3b9edc16 Yang Shi 2019-07-11 1290 if ((nr_pages > 1) && !PageTransHuge(page)) {
98879b3b9edc16 Yang Shi 2019-07-11 1291 sc->nr_scanned -= (nr_pages - 1);
98879b3b9edc16 Yang Shi 2019-07-11 1292 nr_pages = 1;
98879b3b9edc16 Yang Shi 2019-07-11 1293 }
98879b3b9edc16 Yang Shi 2019-07-11 1294
^1da177e4c3f41 Linus Torvalds 2005-04-16 1295 /*
^1da177e4c3f41 Linus Torvalds 2005-04-16 1296 * The page is mapped into the page tables of one or more
^1da177e4c3f41 Linus Torvalds 2005-04-16 1297 * processes. Try to unmap it here.
^1da177e4c3f41 Linus Torvalds 2005-04-16 1298 */
802a3a92ad7ac0 Shaohua Li 2017-05-03 1299 if (page_mapped(page)) {
013339df116c2e Shakeel Butt 2020-12-14 1300 enum ttu_flags flags = TTU_BATCH_FLUSH;
1f318a9b0dc399 Jaewon Kim 2020-06-03 1301 bool was_swapbacked = PageSwapBacked(page);
bd4c82c22c367e Huang Ying 2017-09-06 1302
bd4c82c22c367e Huang Ying 2017-09-06 1303 if (unlikely(PageTransHuge(page)))
bd4c82c22c367e Huang Ying 2017-09-06 1304 flags |= TTU_SPLIT_HUGE_PMD;
1f318a9b0dc399 Jaewon Kim 2020-06-03 1305
bd4c82c22c367e Huang Ying 2017-09-06 1306 if (!try_to_unmap(page, flags)) {
98879b3b9edc16 Yang Shi 2019-07-11 1307 stat->nr_unmap_fail += nr_pages;
1f318a9b0dc399 Jaewon Kim 2020-06-03 1308 if (!was_swapbacked && PageSwapBacked(page))
1f318a9b0dc399 Jaewon Kim 2020-06-03 1309 stat->nr_lazyfree_fail += nr_pages;
^1da177e4c3f41 Linus Torvalds 2005-04-16 1310 goto activate_locked;
^1da177e4c3f41 Linus Torvalds 2005-04-16 1311 }
^1da177e4c3f41 Linus Torvalds 2005-04-16 1312 }
^1da177e4c3f41 Linus Torvalds 2005-04-16 1313
^1da177e4c3f41 Linus Torvalds 2005-04-16 1314 if (PageDirty(page)) {
ee72886d8ed5d9 Mel Gorman 2011-10-31 1315 /*
4eda48235011d6 Johannes Weiner 2017-02-24 1316 * Only kswapd can writeback filesystem pages
4eda48235011d6 Johannes Weiner 2017-02-24 1317 * to avoid risk of stack overflow. But avoid
4eda48235011d6 Johannes Weiner 2017-02-24 1318 * injecting inefficient single-page IO into
4eda48235011d6 Johannes Weiner 2017-02-24 1319 * flusher writeback as much as possible: only
4eda48235011d6 Johannes Weiner 2017-02-24 1320 * write pages when we've encountered many
4eda48235011d6 Johannes Weiner 2017-02-24 1321 * dirty pages, and when we've already scanned
4eda48235011d6 Johannes Weiner 2017-02-24 1322 * the rest of the LRU for clean pages and see
4eda48235011d6 Johannes Weiner 2017-02-24 1323 * the same dirty pages again (PageReclaim).
ee72886d8ed5d9 Mel Gorman 2011-10-31 1324 */
9de4f22a60f731 Huang Ying 2020-04-06 1325 if (page_is_file_lru(page) &&
4eda48235011d6 Johannes Weiner 2017-02-24 1326 (!current_is_kswapd() || !PageReclaim(page) ||
599d0c954f91d0 Mel Gorman 2016-07-28 1327 !test_bit(PGDAT_DIRTY, &pgdat->flags))) {
49ea7eb65e7c50 Mel Gorman 2011-10-31 1328 /*
49ea7eb65e7c50 Mel Gorman 2011-10-31 1329 * Immediately reclaim when written back.
49ea7eb65e7c50 Mel Gorman 2011-10-31 1330 * Similar in principal to deactivate_page()
49ea7eb65e7c50 Mel Gorman 2011-10-31 1331 * except we already have the page isolated
49ea7eb65e7c50 Mel Gorman 2011-10-31 1332 * and know it's dirty
49ea7eb65e7c50 Mel Gorman 2011-10-31 1333 */
c4a25635b60d08 Mel Gorman 2016-07-28 1334 inc_node_page_state(page, NR_VMSCAN_IMMEDIATE);
49ea7eb65e7c50 Mel Gorman 2011-10-31 1335 SetPageReclaim(page);
49ea7eb65e7c50 Mel Gorman 2011-10-31 1336
c55e8d035b28b2 Johannes Weiner 2017-02-24 1337 goto activate_locked;
ee72886d8ed5d9 Mel Gorman 2011-10-31 1338 }
ee72886d8ed5d9 Mel Gorman 2011-10-31 1339
dfc8d636cdb95f Johannes Weiner 2010-03-05 1340 if (references == PAGEREF_RECLAIM_CLEAN)
^1da177e4c3f41 Linus Torvalds 2005-04-16 1341 goto keep_locked;
4dd4b920218326 Andrew Morton 2008-03-24 1342 if (!may_enter_fs)
^1da177e4c3f41 Linus Torvalds 2005-04-16 1343 goto keep_locked;
52a8363eae3872 Christoph Lameter 2006-02-01 1344 if (!sc->may_writepage)
^1da177e4c3f41 Linus Torvalds 2005-04-16 1345 goto keep_locked;
^1da177e4c3f41 Linus Torvalds 2005-04-16 1346
d950c9477d51f0 Mel Gorman 2015-09-04 1347 /*
d950c9477d51f0 Mel Gorman 2015-09-04 1348 * Page is dirty. Flush the TLB if a writable entry
d950c9477d51f0 Mel Gorman 2015-09-04 1349 * potentially exists to avoid CPU writes after IO
d950c9477d51f0 Mel Gorman 2015-09-04 1350 * starts and then write it out here.
d950c9477d51f0 Mel Gorman 2015-09-04 1351 */
d950c9477d51f0 Mel Gorman 2015-09-04 1352 try_to_unmap_flush_dirty();
cb16556d913f2b Yang Shi 2019-11-30 1353 switch (pageout(page, mapping)) {
^1da177e4c3f41 Linus Torvalds 2005-04-16 1354 case PAGE_KEEP:
^1da177e4c3f41 Linus Torvalds 2005-04-16 1355 goto keep_locked;
^1da177e4c3f41 Linus Torvalds 2005-04-16 1356 case PAGE_ACTIVATE:
^1da177e4c3f41 Linus Torvalds 2005-04-16 1357 goto activate_locked;
^1da177e4c3f41 Linus Torvalds 2005-04-16 1358 case PAGE_SUCCESS:
6c357848b44b40 Matthew Wilcox (Oracle 2020-08-14 1359) stat->nr_pageout += thp_nr_pages(page);
96f8bf4fb1dd26 Johannes Weiner 2020-06-03 1360
7d3579e8e61937 KOSAKI Motohiro 2010-10-26 1361 if (PageWriteback(page))
41ac1999c3e356 Mel Gorman 2012-05-29 1362 goto keep;
7d3579e8e61937 KOSAKI Motohiro 2010-10-26 1363 if (PageDirty(page))
^1da177e4c3f41 Linus Torvalds 2005-04-16 1364 goto keep;
7d3579e8e61937 KOSAKI Motohiro 2010-10-26 1365
^1da177e4c3f41 Linus Torvalds 2005-04-16 1366 /*
^1da177e4c3f41 Linus Torvalds 2005-04-16 1367 * A synchronous write - probably a ramdisk. Go
^1da177e4c3f41 Linus Torvalds 2005-04-16 1368 * ahead and try to reclaim the page.
^1da177e4c3f41 Linus Torvalds 2005-04-16 1369 */
529ae9aaa08378 Nick Piggin 2008-08-02 1370 if (!trylock_page(page))
^1da177e4c3f41 Linus Torvalds 2005-04-16 1371 goto keep;
^1da177e4c3f41 Linus Torvalds 2005-04-16 1372 if (PageDirty(page) || PageWriteback(page))
^1da177e4c3f41 Linus Torvalds 2005-04-16 1373 goto keep_locked;
^1da177e4c3f41 Linus Torvalds 2005-04-16 1374 mapping = page_mapping(page);
01359eb2013b4b Gustavo A. R. Silva 2020-12-14 1375 fallthrough;
^1da177e4c3f41 Linus Torvalds 2005-04-16 1376 case PAGE_CLEAN:
^1da177e4c3f41 Linus Torvalds 2005-04-16 1377 ; /* try to free the page below */
^1da177e4c3f41 Linus Torvalds 2005-04-16 1378 }
^1da177e4c3f41 Linus Torvalds 2005-04-16 1379 }
^1da177e4c3f41 Linus Torvalds 2005-04-16 1380
^1da177e4c3f41 Linus Torvalds 2005-04-16 1381 /*
^1da177e4c3f41 Linus Torvalds 2005-04-16 1382 * If the page has buffers, try to free the buffer mappings
^1da177e4c3f41 Linus Torvalds 2005-04-16 1383 * associated with this page. If we succeed we try to free
^1da177e4c3f41 Linus Torvalds 2005-04-16 1384 * the page as well.
^1da177e4c3f41 Linus Torvalds 2005-04-16 1385 *
^1da177e4c3f41 Linus Torvalds 2005-04-16 1386 * We do this even if the page is PageDirty().
^1da177e4c3f41 Linus Torvalds 2005-04-16 1387 * try_to_release_page() does not perform I/O, but it is
^1da177e4c3f41 Linus Torvalds 2005-04-16 1388 * possible for a page to have PageDirty set, but it is actually
^1da177e4c3f41 Linus Torvalds 2005-04-16 1389 * clean (all its buffers are clean). This happens if the
^1da177e4c3f41 Linus Torvalds 2005-04-16 1390 * buffers were written out directly, with submit_bh(). ext3
^1da177e4c3f41 Linus Torvalds 2005-04-16 1391 * will do this, as well as the blockdev mapping.
^1da177e4c3f41 Linus Torvalds 2005-04-16 1392 * try_to_release_page() will discover that cleanness and will
^1da177e4c3f41 Linus Torvalds 2005-04-16 1393 * drop the buffers and mark the page clean - it can be freed.
^1da177e4c3f41 Linus Torvalds 2005-04-16 1394 *
^1da177e4c3f41 Linus Torvalds 2005-04-16 1395 * Rarely, pages can have buffers and no ->mapping. These are
^1da177e4c3f41 Linus Torvalds 2005-04-16 1396 * the pages which were not successfully invalidated in
d12b8951ad17cd Yang Shi 2020-12-14 1397 * truncate_cleanup_page(). We try to drop those buffers here
^1da177e4c3f41 Linus Torvalds 2005-04-16 1398 * and if that worked, and the page is no longer mapped into
^1da177e4c3f41 Linus Torvalds 2005-04-16 1399 * process address space (page_count == 1) it can be freed.
^1da177e4c3f41 Linus Torvalds 2005-04-16 1400 * Otherwise, leave the page on the LRU so it is swappable.
^1da177e4c3f41 Linus Torvalds 2005-04-16 1401 */
266cf658efcf6a David Howells 2009-04-03 1402 if (page_has_private(page)) {
^1da177e4c3f41 Linus Torvalds 2005-04-16 1403 if (!try_to_release_page(page, sc->gfp_mask))
^1da177e4c3f41 Linus Torvalds 2005-04-16 1404 goto activate_locked;
e286781d5f2e9c Nick Piggin 2008-07-25 1405 if (!mapping && page_count(page) == 1) {
e286781d5f2e9c Nick Piggin 2008-07-25 1406 unlock_page(page);
e286781d5f2e9c Nick Piggin 2008-07-25 1407 if (put_page_testzero(page))
^1da177e4c3f41 Linus Torvalds 2005-04-16 1408 goto free_it;
e286781d5f2e9c Nick Piggin 2008-07-25 1409 else {
e286781d5f2e9c Nick Piggin 2008-07-25 1410 /*
e286781d5f2e9c Nick Piggin 2008-07-25 1411 * rare race with speculative reference.
e286781d5f2e9c Nick Piggin 2008-07-25 1412 * the speculative reference will free
e286781d5f2e9c Nick Piggin 2008-07-25 1413 * this page shortly, so we may
e286781d5f2e9c Nick Piggin 2008-07-25 1414 * increment nr_reclaimed here (and
e286781d5f2e9c Nick Piggin 2008-07-25 1415 * leave it off the LRU).
e286781d5f2e9c Nick Piggin 2008-07-25 1416 */
e286781d5f2e9c Nick Piggin 2008-07-25 1417 nr_reclaimed++;
e286781d5f2e9c Nick Piggin 2008-07-25 1418 continue;
e286781d5f2e9c Nick Piggin 2008-07-25 1419 }
e286781d5f2e9c Nick Piggin 2008-07-25 1420 }
^1da177e4c3f41 Linus Torvalds 2005-04-16 1421 }
^1da177e4c3f41 Linus Torvalds 2005-04-16 1422
802a3a92ad7ac0 Shaohua Li 2017-05-03 1423 if (PageAnon(page) && !PageSwapBacked(page)) {
802a3a92ad7ac0 Shaohua Li 2017-05-03 1424 /* follow __remove_mapping for reference */
802a3a92ad7ac0 Shaohua Li 2017-05-03 1425 if (!page_ref_freeze(page, 1))
49d2e9cc454436 Christoph Lameter 2006-01-08 1426 goto keep_locked;
802a3a92ad7ac0 Shaohua Li 2017-05-03 1427 if (PageDirty(page)) {
802a3a92ad7ac0 Shaohua Li 2017-05-03 1428 page_ref_unfreeze(page, 1);
802a3a92ad7ac0 Shaohua Li 2017-05-03 1429 goto keep_locked;
802a3a92ad7ac0 Shaohua Li 2017-05-03 1430 }
^1da177e4c3f41 Linus Torvalds 2005-04-16 1431
802a3a92ad7ac0 Shaohua Li 2017-05-03 1432 count_vm_event(PGLAZYFREED);
2262185c5b287f Roman Gushchin 2017-07-06 1433 count_memcg_page_event(page, PGLAZYFREED);
b910718a948a91 Johannes Weiner 2019-11-30 1434 } else if (!mapping || !__remove_mapping(mapping, page, true,
b910718a948a91 Johannes Weiner 2019-11-30 1435 sc->target_mem_cgroup))
802a3a92ad7ac0 Shaohua Li 2017-05-03 1436 goto keep_locked;
9a1ea439b16b92 Hugh Dickins 2018-12-28 1437
9a1ea439b16b92 Hugh Dickins 2018-12-28 1438 unlock_page(page);
e286781d5f2e9c Nick Piggin 2008-07-25 1439 free_it:
98879b3b9edc16 Yang Shi 2019-07-11 1440 /*
98879b3b9edc16 Yang Shi 2019-07-11 1441 * THP may get swapped out in a whole, need account
98879b3b9edc16 Yang Shi 2019-07-11 1442 * all base pages.
98879b3b9edc16 Yang Shi 2019-07-11 1443 */
98879b3b9edc16 Yang Shi 2019-07-11 1444 nr_reclaimed += nr_pages;
abe4c3b50c3f25 Mel Gorman 2010-08-09 1445
abe4c3b50c3f25 Mel Gorman 2010-08-09 1446 /*
abe4c3b50c3f25 Mel Gorman 2010-08-09 1447 * Is there need to periodically free_page_list? It would
abe4c3b50c3f25 Mel Gorman 2010-08-09 1448 * appear not as the counts should be low
abe4c3b50c3f25 Mel Gorman 2010-08-09 1449 */
7ae88534cdd962 Yang Shi 2019-09-23 1450 if (unlikely(PageTransHuge(page)))
ff45fc3ca0f3c3 Matthew Wilcox (Oracle 2020-06-03 1451) destroy_compound_page(page);
7ae88534cdd962 Yang Shi 2019-09-23 1452 else
abe4c3b50c3f25 Mel Gorman 2010-08-09 1453 list_add(&page->lru, &free_pages);
^1da177e4c3f41 Linus Torvalds 2005-04-16 1454 continue;
^1da177e4c3f41 Linus Torvalds 2005-04-16 1455
98879b3b9edc16 Yang Shi 2019-07-11 1456 activate_locked_split:
98879b3b9edc16 Yang Shi 2019-07-11 1457 /*
98879b3b9edc16 Yang Shi 2019-07-11 1458 * The tail pages that are failed to add into swap cache
98879b3b9edc16 Yang Shi 2019-07-11 1459 * reach here. Fixup nr_scanned and nr_pages.
98879b3b9edc16 Yang Shi 2019-07-11 1460 */
98879b3b9edc16 Yang Shi 2019-07-11 1461 if (nr_pages > 1) {
98879b3b9edc16 Yang Shi 2019-07-11 1462 sc->nr_scanned -= (nr_pages - 1);
98879b3b9edc16 Yang Shi 2019-07-11 1463 nr_pages = 1;
98879b3b9edc16 Yang Shi 2019-07-11 1464 }
^1da177e4c3f41 Linus Torvalds 2005-04-16 1465 activate_locked:
68a22394c286a2 Rik van Riel 2008-10-18 1466 /* Not a candidate for swapping, so reclaim swap space. */
ad6b67041a4549 Minchan Kim 2017-05-03 1467 if (PageSwapCache(page) && (mem_cgroup_swap_full(page) ||
ad6b67041a4549 Minchan Kim 2017-05-03 1468 PageMlocked(page)))
a2c43eed8334e8 Hugh Dickins 2009-01-06 1469 try_to_free_swap(page);
309381feaee564 Sasha Levin 2014-01-23 1470 VM_BUG_ON_PAGE(PageActive(page), page);
ad6b67041a4549 Minchan Kim 2017-05-03 1471 if (!PageMlocked(page)) {
9de4f22a60f731 Huang Ying 2020-04-06 1472 int type = page_is_file_lru(page);
^1da177e4c3f41 Linus Torvalds 2005-04-16 1473 SetPageActive(page);
98879b3b9edc16 Yang Shi 2019-07-11 1474 stat->nr_activate[type] += nr_pages;
2262185c5b287f Roman Gushchin 2017-07-06 1475 count_memcg_page_event(page, PGACTIVATE);
ad6b67041a4549 Minchan Kim 2017-05-03 1476 }
^1da177e4c3f41 Linus Torvalds 2005-04-16 1477 keep_locked:
^1da177e4c3f41 Linus Torvalds 2005-04-16 1478 unlock_page(page);
^1da177e4c3f41 Linus Torvalds 2005-04-16 1479 keep:
^1da177e4c3f41 Linus Torvalds 2005-04-16 1480 list_add(&page->lru, &ret_pages);
309381feaee564 Sasha Levin 2014-01-23 1481 VM_BUG_ON_PAGE(PageLRU(page) || PageUnevictable(page), page);
^1da177e4c3f41 Linus Torvalds 2005-04-16 1482 }
abe4c3b50c3f25 Mel Gorman 2010-08-09 1483
98879b3b9edc16 Yang Shi 2019-07-11 1484 pgactivate = stat->nr_activate[0] + stat->nr_activate[1];
98879b3b9edc16 Yang Shi 2019-07-11 1485
747db954cab64c Johannes Weiner 2014-08-08 1486 mem_cgroup_uncharge_list(&free_pages);
72b252aed506b8 Mel Gorman 2015-09-04 1487 try_to_unmap_flush();
2d4894b5d2ae0f Mel Gorman 2017-11-15 1488 free_unref_page_list(&free_pages);
abe4c3b50c3f25 Mel Gorman 2010-08-09 1489
^1da177e4c3f41 Linus Torvalds 2005-04-16 1490 list_splice(&ret_pages, page_list);
886cf1901db962 Kirill Tkhai 2019-05-13 1491 count_vm_events(PGACTIVATE, pgactivate);
060f005f074791 Kirill Tkhai 2019-03-05 1492
05ff51376f01fd Andrew Morton 2006-03-22 1493 return nr_reclaimed;
^1da177e4c3f41 Linus Torvalds 2005-04-16 1494 }
^1da177e4c3f41 Linus Torvalds 2005-04-16 1495
:::::: The code at line 1071 was first introduced by commit
:::::: 730ec8c01a2bd6a311ada404398f44c142ac5e8e mm/vmscan.c: change prototype for shrink_page_list
:::::: TO: Maninder Singh <maninder1.s@...sung.com>
:::::: CC: Linus Torvalds <torvalds@...ux-foundation.org>
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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