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| author | David Rientjes <rientjes@google.com> | 2017-09-08 16:13:41 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-09-08 18:26:47 -0700 |
| commit | 14038302944a1ceda62a104c137d24a62604d98e (patch) | |
| tree | 94ad493be1d804f812c5fb0729de9afcb8c1d7a5 /include | |
| parent | 855d97657d4d335970622f0d95ca4966d3f77ee7 (diff) | |
| download | lwn-14038302944a1ceda62a104c137d24a62604d98e.tar.gz lwn-14038302944a1ceda62a104c137d24a62604d98e.zip | |
fs, proc: unconditional cond_resched when reading smaps
If there are large numbers of hugepages to iterate while reading
/proc/pid/smaps, the page walk never does cond_resched(). On archs
without split pmd locks, there can be significant and observable
contention on mm->page_table_lock which cause lengthy delays without
rescheduling.
Always reschedule in smaps_pte_range() if necessary since the pagewalk
iteration can be expensive.
Link: http://lkml.kernel.org/r/alpine.DEB.2.10.1708211405520.131071@chino.kir.corp.google.com
Signed-off-by: David Rientjes <rientjes@google.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Hugh Dickins <hughd@google.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
0 files changed, 0 insertions, 0 deletions