From: Muchun Song <songmuchun@bytedance.com>
To: akpm@linux-foundation.org, sfr@canb.auug.org.au,
osalvador@suse.de, alexander.h.duyck@linux.intel.com,
mhocko@suse.com, yang.shi@linux.alibaba.com, david@redhat.com,
hannes@cmpxchg.org, hughd@google.com
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Muchun Song <songmuchun@bytedance.com>
Subject: [PATCH] mm/memory.c: Introduce non-atomic __{Set,Clear}PageSwapCache
Date: Mon, 19 Oct 2020 18:15:20 +0800 [thread overview]
Message-ID: <20201019101520.12283-1-songmuchun@bytedance.com> (raw)
For the exclusive reference page, the non-atomic operations is enough,
so replace them to non-atomic operations.
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
---
include/linux/page-flags.h | 2 ++
mm/memory.c | 4 ++--
2 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index fbbb841a9346..ec039dde5e4b 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -401,6 +401,8 @@ static __always_inline int PageSwapCache(struct page *page)
}
SETPAGEFLAG(SwapCache, swapcache, PF_NO_TAIL)
CLEARPAGEFLAG(SwapCache, swapcache, PF_NO_TAIL)
+__SETPAGEFLAG(SwapCache, swapcache, PF_NO_TAIL)
+__CLEARPAGEFLAG(SwapCache, swapcache, PF_NO_TAIL)
#else
PAGEFLAG_FALSE(SwapCache)
#endif
diff --git a/mm/memory.c b/mm/memory.c
index 2d267ef6621a..02dd62da26e0 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3128,10 +3128,10 @@ vm_fault_t do_swap_page(struct vm_fault *vmf)
set_page_private(page, entry.val);
/* Tell memcg to use swap ownership records */
- SetPageSwapCache(page);
+ __SetPageSwapCache(page);
err = mem_cgroup_charge(page, vma->vm_mm,
GFP_KERNEL);
- ClearPageSwapCache(page);
+ __ClearPageSwapCache(page);
if (err) {
ret = VM_FAULT_OOM;
goto out_page;
--
2.20.1
next reply other threads:[~2020-10-19 10:17 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-19 10:15 Muchun Song [this message]
2020-10-19 12:31 ` [PATCH] mm/memory.c: Introduce non-atomic __{Set,Clear}PageSwapCache Michal Hocko
2020-10-19 14:58 ` [External] " Muchun Song
2020-10-20 11:50 ` Xu, Yanfei
2020-10-20 13:08 ` Muchun Song
2020-10-21 2:52 ` Xu, Yanfei
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20201019101520.12283-1-songmuchun@bytedance.com \
--to=songmuchun@bytedance.com \
--cc=akpm@linux-foundation.org \
--cc=alexander.h.duyck@linux.intel.com \
--cc=david@redhat.com \
--cc=hannes@cmpxchg.org \
--cc=hughd@google.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mhocko@suse.com \
--cc=osalvador@suse.de \
--cc=sfr@canb.auug.org.au \
--cc=yang.shi@linux.alibaba.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).