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authorKonstantin Khlebnikov <koct9i@gmail.com>2015-01-08 14:32:15 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2015-01-08 15:10:51 -0800
commit7a3ef208e662f4b63d43a23f61a64a129c525bbc (patch)
tree130f561d487db5224bf6501fdd7182c92eb7ff8e /mm/memory.c
parent3245d6acab981a2388ffb877c7ecc97e763c59d4 (diff)
downloadlinux-stericsson-7a3ef208e662f4b63d43a23f61a64a129c525bbc.tar.gz
mm: prevent endless growth of anon_vma hierarchy
Constantly forking task causes unlimited grow of anon_vma chain. Each next child allocates new level of anon_vmas and links vma to all previous levels because pages might be inherited from any level. This patch adds heuristic which decides to reuse existing anon_vma instead of forking new one. It adds counter anon_vma->degree which counts linked vmas and directly descending anon_vmas and reuses anon_vma if counter is lower than two. As a result each anon_vma has either vma or at least two descending anon_vmas. In such trees half of nodes are leafs with alive vmas, thus count of anon_vmas is no more than two times bigger than count of vmas. This heuristic reuses anon_vmas as few as possible because each reuse adds false aliasing among vmas and rmap walker ought to scan more ptes when it searches where page is might be mapped. Link: http://lkml.kernel.org/r/20120816024610.GA5350@evergreen.ssec.wisc.edu Fixes: 5beb49305251 ("mm: change anon_vma linking to fix multi-process server scalability issue") [akpm@linux-foundation.org: fix typo, per Rik] Signed-off-by: Konstantin Khlebnikov <koct9i@gmail.com> Reported-by: Daniel Forrest <dan.forrest@ssec.wisc.edu> Tested-by: Michal Hocko <mhocko@suse.cz> Tested-by: Jerome Marchand <jmarchan@redhat.com> Reviewed-by: Michal Hocko <mhocko@suse.cz> Reviewed-by: Rik van Riel <riel@redhat.com> Cc: <stable@vger.kernel.org> [2.6.34+] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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