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| author | Hugh Dickins <hughd@google.com> | 2012-01-13 02:19:54 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-01-13 05:13:10 +0100 |
| commit | 90b3feaec8ffb167abd8903bf111605c2f035aa8 (patch) | |
| tree | 503c27c343397e1c94dce61e922fae18c7cd7172 /mm/swap.c | |
| parent | memcg: fix split_huge_page_refcounts() (diff) | |
| download | linux-90b3feaec8ffb167abd8903bf111605c2f035aa8.tar.xz linux-90b3feaec8ffb167abd8903bf111605c2f035aa8.zip | |
memcg: fix mem_cgroup_print_bad_page
If DEBUG_VM, mem_cgroup_print_bad_page() is called whenever bad_page()
shows a "Bad page state" message, removes page from circulation, adds a
taint and continues. This is at a very low level, often when a spinlock
is held (sometimes when page table lock is held, for example).
We want to recover from this badness, not make it worse: we must not
kmalloc memory here, we must not do a cgroup path lookup via dubious
pointers. No doubt that code was useful to debug a particular case at one
time, and may be again, but take it out of the mainline kernel.
Signed-off-by: Hugh Dickins <hughd@google.com>
Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/swap.c')
0 files changed, 0 insertions, 0 deletions