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authorKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>2009-01-07 18:08:35 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-08 08:31:10 -0800
commitb5a84319a4343a0db753436fd8147e61eaafa7ea (patch)
tree5faae671b431b50a32a2d8c7a57cc9361d8f336d /mm/shmem.c
parent544122e5e0ee27d5aac4a441f7746712afbf248c (diff)
downloadlinux-b5a84319a4343a0db753436fd8147e61eaafa7ea.tar.bz2
memcg: fix shmem's swap accounting
Now, you can see following even when swap accounting is enabled. 1. Create Group 01, and 02. 2. allocate a "file" on tmpfs by a task under 01. 3. swap out the "file" (by memory pressure) 4. Read "file" from a task in group 02. 5. the charge of "file" is moved to group 02. This is not ideal behavior. This is because SwapCache which was loaded by read-ahead is not taken into account.. This is a patch to fix shmem's swapcache behavior. - remove mem_cgroup_cache_charge_swapin(). - Add SwapCache handler routine to mem_cgroup_cache_charge(). By this, shmem's file cache is charged at add_to_page_cache() with GFP_NOWAIT. - pass the page of swapcache to shrink_mem_cgroup. Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Cc: Balbir Singh <balbir@in.ibm.com> Cc: Paul Menage <menage@google.com> Cc: Li Zefan <lizf@cn.fujitsu.com> Cc: Hugh Dickins <hugh@veritas.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/shmem.c')
-rw-r--r--mm/shmem.c30
1 files changed, 12 insertions, 18 deletions
diff --git a/mm/shmem.c b/mm/shmem.c
index bbb7b043c986..5d0de96c9789 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -929,11 +929,11 @@ found:
if (!inode)
goto out;
/*
- * Charge page using GFP_HIGHUSER_MOVABLE while we can wait.
- * charged back to the user(not to caller) when swap account is used.
+ * Charge page using GFP_KERNEL while we can wait.
+ * Charged back to the user(not to caller) when swap account is used.
+ * add_to_page_cache() will be called with GFP_NOWAIT.
*/
- error = mem_cgroup_cache_charge_swapin(page, current->mm, GFP_KERNEL,
- true);
+ error = mem_cgroup_cache_charge(page, current->mm, GFP_KERNEL);
if (error)
goto out;
error = radix_tree_preload(GFP_KERNEL);
@@ -1270,16 +1270,6 @@ repeat:
goto repeat;
}
wait_on_page_locked(swappage);
- /*
- * We want to avoid charge at add_to_page_cache().
- * charge against this swap cache here.
- */
- if (mem_cgroup_cache_charge_swapin(swappage,
- current->mm, gfp & GFP_RECLAIM_MASK, false)) {
- page_cache_release(swappage);
- error = -ENOMEM;
- goto failed;
- }
page_cache_release(swappage);
goto repeat;
}
@@ -1334,15 +1324,19 @@ repeat:
} else {
shmem_swp_unmap(entry);
spin_unlock(&info->lock);
- unlock_page(swappage);
- page_cache_release(swappage);
if (error == -ENOMEM) {
/* allow reclaim from this memory cgroup */
- error = mem_cgroup_shrink_usage(current->mm,
+ error = mem_cgroup_shrink_usage(swappage,
+ current->mm,
gfp);
- if (error)
+ if (error) {
+ unlock_page(swappage);
+ page_cache_release(swappage);
goto failed;
+ }
}
+ unlock_page(swappage);
+ page_cache_release(swappage);
goto repeat;
}
} else if (sgp == SGP_READ && !filepage) {