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Message-Id: <20240422143923.3927601-4-john.g.garry@oracle.com>
Date: Mon, 22 Apr 2024 14:39:19 +0000
From: John Garry <john.g.garry@...cle.com>
To: axboe@...nel.dk, brauner@...nel.org, djwong@...nel.org,
viro@...iv.linux.org.uk, jack@...e.cz, akpm@...ux-foundation.org,
willy@...radead.org, dchinner@...hat.com, tytso@....edu, hch@....de,
martin.petersen@...cle.com, nilay@...ux.ibm.com, ritesh.list@...il.com,
mcgrof@...nel.org
Cc: linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
linux-mm@...ck.org, ojaswin@...ux.ibm.com, p.raghav@...sung.com,
jbongio@...gle.com, okiselev@...zon.com,
John Garry <john.g.garry@...cle.com>
Subject: [PATCH RFC 3/7] mm: Add PG_atomic
Add page flag PG_atomic, meaning that a folio needs to be written back
atomically.
Signed-off-by: John Garry <john.g.garry@...cle.com>
---
include/linux/page-flags.h | 5 +++++
include/trace/events/mmflags.h | 3 ++-
2 files changed, 7 insertions(+), 1 deletion(-)
diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index 652d77805e99..e777b2e7daaf 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -119,6 +119,7 @@ enum pageflags {
PG_reclaim, /* To be reclaimed asap */
PG_swapbacked, /* Page is backed by RAM/swap */
PG_unevictable, /* Page is "unevictable" */
+ PG_atomic,
#ifdef CONFIG_MMU
PG_mlocked, /* Page is vma mlocked */
#endif
@@ -579,6 +580,10 @@ PAGEFLAG(Unevictable, unevictable, PF_HEAD)
__CLEARPAGEFLAG(Unevictable, unevictable, PF_HEAD)
TESTCLEARFLAG(Unevictable, unevictable, PF_HEAD)
+PAGEFLAG(Atomic, atomic, PF_HEAD)
+ __CLEARPAGEFLAG(Atomic, atomic, PF_HEAD)
+ TESTCLEARFLAG(Atomic, atomic, PF_HEAD)
+
#ifdef CONFIG_MMU
PAGEFLAG(Mlocked, mlocked, PF_NO_TAIL)
__CLEARPAGEFLAG(Mlocked, mlocked, PF_NO_TAIL)
diff --git a/include/trace/events/mmflags.h b/include/trace/events/mmflags.h
index d801409b33cf..3c83e7b93898 100644
--- a/include/trace/events/mmflags.h
+++ b/include/trace/events/mmflags.h
@@ -118,7 +118,8 @@
DEF_PAGEFLAG_NAME(mappedtodisk), \
DEF_PAGEFLAG_NAME(reclaim), \
DEF_PAGEFLAG_NAME(swapbacked), \
- DEF_PAGEFLAG_NAME(unevictable) \
+ DEF_PAGEFLAG_NAME(unevictable), \
+ DEF_PAGEFLAG_NAME(atomic) \
IF_HAVE_PG_MLOCK(mlocked) \
IF_HAVE_PG_UNCACHED(uncached) \
IF_HAVE_PG_HWPOISON(hwpoison) \
--
2.31.1
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