mm: avoid livelock on !__GFP_FS allocations

Under the following conditions, __alloc_pages_slowpath can loop
forever:
gfp_mask & __GFP_WAIT is true
gfp_mask & __GFP_FS is false
reclaim and compaction make no progress
order <= PAGE_ALLOC_COSTLY_ORDER

The gfp conditions are normally invalid, because !__GFP_FS
disables most of the reclaim methods that __GFP_WAIT would
wait for.  However, these conditions happen very often during
suspend and resume, when pm_restrict_gfp_mask() effectively
converts all GFP_KERNEL allocations into __GFP_WAIT.

The oom killer is not run because gfp_mask & __GFP_FS is false,
but should_alloc_retry will always return true when order is less
than PAGE_ALLOC_COSTLY_ORDER.  __alloc_pages_slowpath will
loop forever between the rebalance label and should_alloc_retry,
unless another thread happens to release enough pages to satisfy
the allocation.

Add a check to detect when PM has disabled __GFP_FS, and do not
retry if reclaim is not making any progress.

[taken from patch on lkml by Mel Gorman, commit message by ccross]
Change-Id: I864a24e9d9fd98bd0e3d6e9c1e85b6c1b766850e
Signed-off-by: Colin Cross <ccross@android.com>

0 files changed, 0 insertions, 0 deletions