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authorKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>2012-10-19 17:00:55 +0900
committerLinus Torvalds <torvalds@linux-foundation.org>2012-10-19 14:32:10 -0700
commit9e7814404b77c3e8920bee4277162bf3a7460505 (patch)
treef7542b049f29150680507dd211925401beadac9a /.gitignore
parent3b641bf453497d76ea28c5fc1c666f424ead6dcf (diff)
downloadvexpress-lsk-9e7814404b77c3e8920bee4277162bf3a7460505.tar.gz
hold task->mempolicy while numa_maps scans.
/proc/<pid>/numa_maps scans vma and show mempolicy under mmap_sem. It sometimes accesses task->mempolicy which can be freed without mmap_sem and numa_maps can show some garbage while scanning. This patch tries to take reference count of task->mempolicy at reading numa_maps before calling get_vma_policy(). By this, task->mempolicy will not be freed until numa_maps reaches its end. V2->v3 - updated comments to be more verbose. - removed task_lock() in numa_maps code. V1->V2 - access task->mempolicy only once and remember it. Becase kernel/exit.c can overwrite it. Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Acked-by: David Rientjes <rientjes@google.com> Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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