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Date: Mon, 15 Jun 2020 16:25:56 +0200
From: Oleksandr Natalenko <oleksandr@...hat.com>
To: Nitin Gupta <nigupta@...dia.com>
Cc: Mel Gorman <mgorman@...hsingularity.net>,
Michal Hocko <mhocko@...e.com>,
Vlastimil Babka <vbabka@...e.cz>,
Matthew Wilcox <willy@...radead.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Mike Kravetz <mike.kravetz@...cle.com>,
Joonsoo Kim <iamjoonsoo.kim@....com>,
David Rientjes <rientjes@...gle.com>,
Nitin Gupta <ngupta@...ingupta.dev>,
linux-kernel <linux-kernel@...r.kernel.org>,
linux-mm <linux-mm@...ck.org>,
Linux API <linux-api@...r.kernel.org>
Subject: Re: [PATCH v6] mm: Proactive compaction
On Mon, Jun 15, 2020 at 10:29:01AM +0200, Oleksandr Natalenko wrote:
> Just to let you know, this fails to compile for me with THP disabled on
> v5.8-rc1:
>
> CC mm/compaction.o
> In file included from ./include/linux/dev_printk.h:14,
> from ./include/linux/device.h:15,
> from ./include/linux/node.h:18,
> from ./include/linux/cpu.h:17,
> from mm/compaction.c:11:
> In function ‘fragmentation_score_zone’,
> inlined from ‘__compact_finished’ at mm/compaction.c:1982:11,
> inlined from ‘compact_zone’ at mm/compaction.c:2062:8:
> ./include/linux/compiler.h:392:38: error: call to ‘__compiletime_assert_397’ declared with attribute error: BUILD_BUG failed
> 392 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
> | ^
> ./include/linux/compiler.h:373:4: note: in definition of macro ‘__compiletime_assert’
> 373 | prefix ## suffix(); \
> | ^~~~~~
> ./include/linux/compiler.h:392:2: note: in expansion of macro ‘_compiletime_assert’
> 392 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
> | ^~~~~~~~~~~~~~~~~~~
> ./include/linux/build_bug.h:39:37: note: in expansion of macro ‘compiletime_assert’
> 39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
> | ^~~~~~~~~~~~~~~~~~
> ./include/linux/build_bug.h:59:21: note: in expansion of macro ‘BUILD_BUG_ON_MSG’
> 59 | #define BUILD_BUG() BUILD_BUG_ON_MSG(1, "BUILD_BUG failed")
> | ^~~~~~~~~~~~~~~~
> ./include/linux/huge_mm.h:319:28: note: in expansion of macro ‘BUILD_BUG’
> 319 | #define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
> | ^~~~~~~~~
> ./include/linux/huge_mm.h:115:26: note: in expansion of macro ‘HPAGE_PMD_SHIFT’
> 115 | #define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
> | ^~~~~~~~~~~~~~~
> mm/compaction.c:64:32: note: in expansion of macro ‘HPAGE_PMD_ORDER’
> 64 | #define COMPACTION_HPAGE_ORDER HPAGE_PMD_ORDER
> | ^~~~~~~~~~~~~~~
> mm/compaction.c:1898:28: note: in expansion of macro ‘COMPACTION_HPAGE_ORDER’
> 1898 | extfrag_for_order(zone, COMPACTION_HPAGE_ORDER);
> | ^~~~~~~~~~~~~~~~~~~~~~
> In function ‘fragmentation_score_zone’,
> inlined from ‘kcompactd’ at mm/compaction.c:1918:12:
> ./include/linux/compiler.h:392:38: error: call to ‘__compiletime_assert_397’ declared with attribute error: BUILD_BUG failed
> 392 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
> | ^
> ./include/linux/compiler.h:373:4: note: in definition of macro ‘__compiletime_assert’
> 373 | prefix ## suffix(); \
> | ^~~~~~
> ./include/linux/compiler.h:392:2: note: in expansion of macro ‘_compiletime_assert’
> 392 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
> | ^~~~~~~~~~~~~~~~~~~
> ./include/linux/build_bug.h:39:37: note: in expansion of macro ‘compiletime_assert’
> 39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
> | ^~~~~~~~~~~~~~~~~~
> ./include/linux/build_bug.h:59:21: note: in expansion of macro ‘BUILD_BUG_ON_MSG’
> 59 | #define BUILD_BUG() BUILD_BUG_ON_MSG(1, "BUILD_BUG failed")
> | ^~~~~~~~~~~~~~~~
> ./include/linux/huge_mm.h:319:28: note: in expansion of macro ‘BUILD_BUG’
> 319 | #define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
> | ^~~~~~~~~
> ./include/linux/huge_mm.h:115:26: note: in expansion of macro ‘HPAGE_PMD_SHIFT’
> 115 | #define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
> | ^~~~~~~~~~~~~~~
> mm/compaction.c:64:32: note: in expansion of macro ‘HPAGE_PMD_ORDER’
> 64 | #define COMPACTION_HPAGE_ORDER HPAGE_PMD_ORDER
> | ^~~~~~~~~~~~~~~
> mm/compaction.c:1898:28: note: in expansion of macro ‘COMPACTION_HPAGE_ORDER’
> 1898 | extfrag_for_order(zone, COMPACTION_HPAGE_ORDER);
> | ^~~~~~~~~~~~~~~~~~~~~~
> In function ‘fragmentation_score_zone’,
> inlined from ‘kcompactd’ at mm/compaction.c:1918:12:
> ./include/linux/compiler.h:392:38: error: call to ‘__compiletime_assert_397’ declared with attribute error: BUILD_BUG failed
> 392 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
> | ^
> ./include/linux/compiler.h:373:4: note: in definition of macro ‘__compiletime_assert’
> 373 | prefix ## suffix(); \
> | ^~~~~~
> ./include/linux/compiler.h:392:2: note: in expansion of macro ‘_compiletime_assert’
> 392 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
> | ^~~~~~~~~~~~~~~~~~~
> ./include/linux/build_bug.h:39:37: note: in expansion of macro ‘compiletime_assert’
> 39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
> | ^~~~~~~~~~~~~~~~~~
> ./include/linux/build_bug.h:59:21: note: in expansion of macro ‘BUILD_BUG_ON_MSG’
> 59 | #define BUILD_BUG() BUILD_BUG_ON_MSG(1, "BUILD_BUG failed")
> | ^~~~~~~~~~~~~~~~
> ./include/linux/huge_mm.h:319:28: note: in expansion of macro ‘BUILD_BUG’
> 319 | #define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
> | ^~~~~~~~~
> ./include/linux/huge_mm.h:115:26: note: in expansion of macro ‘HPAGE_PMD_SHIFT’
> 115 | #define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
> | ^~~~~~~~~~~~~~~
> mm/compaction.c:64:32: note: in expansion of macro ‘HPAGE_PMD_ORDER’
> 64 | #define COMPACTION_HPAGE_ORDER HPAGE_PMD_ORDER
> | ^~~~~~~~~~~~~~~
> mm/compaction.c:1898:28: note: in expansion of macro ‘COMPACTION_HPAGE_ORDER’
> 1898 | extfrag_for_order(zone, COMPACTION_HPAGE_ORDER);
> | ^~~~~~~~~~~~~~~~~~~~~~
> In function ‘fragmentation_score_zone’,
> inlined from ‘kcompactd’ at mm/compaction.c:1918:12:
> ./include/linux/compiler.h:392:38: error: call to ‘__compiletime_assert_397’ declared with attribute error: BUILD_BUG failed
> 392 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
> | ^
> ./include/linux/compiler.h:373:4: note: in definition of macro ‘__compiletime_assert’
> 373 | prefix ## suffix(); \
> | ^~~~~~
> ./include/linux/compiler.h:392:2: note: in expansion of macro ‘_compiletime_assert’
> 392 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
> | ^~~~~~~~~~~~~~~~~~~
> ./include/linux/build_bug.h:39:37: note: in expansion of macro ‘compiletime_assert’
> 39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
> | ^~~~~~~~~~~~~~~~~~
> ./include/linux/build_bug.h:59:21: note: in expansion of macro ‘BUILD_BUG_ON_MSG’
> 59 | #define BUILD_BUG() BUILD_BUG_ON_MSG(1, "BUILD_BUG failed")
> | ^~~~~~~~~~~~~~~~
> ./include/linux/huge_mm.h:319:28: note: in expansion of macro ‘BUILD_BUG’
> 319 | #define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
> | ^~~~~~~~~
> ./include/linux/huge_mm.h:115:26: note: in expansion of macro ‘HPAGE_PMD_SHIFT’
> 115 | #define HPAGE_PMD_ORDER (HPAGE_PMD_SHIFT-PAGE_SHIFT)
> | ^~~~~~~~~~~~~~~
> mm/compaction.c:64:32: note: in expansion of macro ‘HPAGE_PMD_ORDER’
> 64 | #define COMPACTION_HPAGE_ORDER HPAGE_PMD_ORDER
> | ^~~~~~~~~~~~~~~
> mm/compaction.c:1898:28: note: in expansion of macro ‘COMPACTION_HPAGE_ORDER’
> 1898 | extfrag_for_order(zone, COMPACTION_HPAGE_ORDER);
> | ^~~~~~~~~~~~~~~~~~~~~~
> make[1]: *** [scripts/Makefile.build:281: mm/compaction.o] Error 1
> make: *** [Makefile:1764: mm] Error 2
>
What about doing this:
diff --git a/mm/compaction.c b/mm/compaction.c
index 0d4f91dfb801..ac2030814edb 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -60,7 +60,7 @@ static const int HPAGE_FRAG_CHECK_INTERVAL_MSEC = 500;
* calculates external fragmentation, which is used as
* the "fragmentation score" of a node/zone.
*/
-#if defined HPAGE_PMD_ORDER
+#if defined CONFIG_TRANSPARENT_HUGEPAGE
#define COMPACTION_HPAGE_ORDER HPAGE_PMD_ORDER
#elif defined HUGETLB_PAGE_ORDER
#define COMPACTION_HPAGE_ORDER HUGETLB_PAGE_ORDER
?
--
Best regards,
Oleksandr Natalenko (post-factum)
Principal Software Maintenance Engineer
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