From: Hugh Dickins <hughd@google.com>
To: Mel Gorman <mgorman@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
Ingo Molnar <mingo@kernel.org>,
Sasha Levin <sasha.levin@oracle.com>,
Petr Holasek <pholasek@redhat.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: [PATCH] ksm: make rmap walks more scalable
Date: Wed, 19 Dec 2012 17:44:29 -0800 (PST) [thread overview]
Message-ID: <alpine.LNX.2.00.1212191742440.25409@eggly.anvils> (raw)
In-Reply-To: <alpine.LNX.2.00.1212191735530.25409@eggly.anvils>
The rmap walks in ksm.c are like those in rmap.c:
they can safely be done with anon_vma_lock_read().
Signed-off-by: Hugh Dickins <hughd@google.com>
---
mm/ksm.c | 16 ++++++++--------
1 file changed, 8 insertions(+), 8 deletions(-)
--- 3.7+git/mm/ksm.c 2012-12-16 16:35:08.752441527 -0800
+++ linux/mm/ksm.c 2012-12-19 16:58:05.292145790 -0800
@@ -1624,7 +1624,7 @@ again:
struct anon_vma_chain *vmac;
struct vm_area_struct *vma;
- anon_vma_lock_write(anon_vma);
+ anon_vma_lock_read(anon_vma);
anon_vma_interval_tree_foreach(vmac, &anon_vma->rb_root,
0, ULONG_MAX) {
vma = vmac->vma;
@@ -1648,7 +1648,7 @@ again:
if (!search_new_forks || !mapcount)
break;
}
- anon_vma_unlock(anon_vma);
+ anon_vma_unlock_read(anon_vma);
if (!mapcount)
goto out;
}
@@ -1678,7 +1678,7 @@ again:
struct anon_vma_chain *vmac;
struct vm_area_struct *vma;
- anon_vma_lock_write(anon_vma);
+ anon_vma_lock_read(anon_vma);
anon_vma_interval_tree_foreach(vmac, &anon_vma->rb_root,
0, ULONG_MAX) {
vma = vmac->vma;
@@ -1697,11 +1697,11 @@ again:
ret = try_to_unmap_one(page, vma,
rmap_item->address, flags);
if (ret != SWAP_AGAIN || !page_mapped(page)) {
- anon_vma_unlock(anon_vma);
+ anon_vma_unlock_read(anon_vma);
goto out;
}
}
- anon_vma_unlock(anon_vma);
+ anon_vma_unlock_read(anon_vma);
}
if (!search_new_forks++)
goto again;
@@ -1731,7 +1731,7 @@ again:
struct anon_vma_chain *vmac;
struct vm_area_struct *vma;
- anon_vma_lock_write(anon_vma);
+ anon_vma_lock_read(anon_vma);
anon_vma_interval_tree_foreach(vmac, &anon_vma->rb_root,
0, ULONG_MAX) {
vma = vmac->vma;
@@ -1749,11 +1749,11 @@ again:
ret = rmap_one(page, vma, rmap_item->address, arg);
if (ret != SWAP_AGAIN) {
- anon_vma_unlock(anon_vma);
+ anon_vma_unlock_read(anon_vma);
goto out;
}
}
- anon_vma_unlock(anon_vma);
+ anon_vma_unlock_read(anon_vma);
}
if (!search_new_forks++)
goto again;
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2012-12-20 1:44 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-20 1:42 [PATCH] sched: numa: ksm: fix oops in task_numa_placment() Hugh Dickins
2012-12-20 1:44 ` Hugh Dickins [this message]
2012-12-20 11:17 ` [PATCH] ksm: make rmap walks more scalable Mel Gorman
2012-12-20 21:49 ` Sasha Levin
2012-12-20 22:26 ` Linus Torvalds
2012-12-20 22:40 ` Hugh Dickins
2012-12-20 22:37 ` Hugh Dickins
2012-12-20 22:43 ` Sasha Levin
2012-12-21 0:36 ` Petr Holasek
2012-12-21 2:35 ` Hugh Dickins
2012-12-20 11:14 ` [PATCH] sched: numa: ksm: fix oops in task_numa_placment() Mel Gorman
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=alpine.LNX.2.00.1212191742440.25409@eggly.anvils \
--to=hughd@google.com \
--cc=akpm@linux-foundation.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mgorman@suse.de \
--cc=mingo@kernel.org \
--cc=pholasek@redhat.com \
--cc=sasha.levin@oracle.com \
--cc=torvalds@linux-foundation.org \
/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