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author | Yang Shi <yang.shi@linux.alibaba.com> | 2018-10-26 15:08:54 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-10-26 16:26:35 -0700 |
commit | 9bc8039e715da3b53dbac89525323a9f2f69b7b5 (patch) | |
tree | c21868e74f359da6178fcbd023354a7c148e4145 /LICENSES | |
parent | 85a06835f6f1ba79f0f00838ccd5ad840dd1eafb (diff) | |
download | linux-9bc8039e715da3b53dbac89525323a9f2f69b7b5.tar.bz2 |
mm: brk: downgrade mmap_sem to read when shrinking
brk might be used to shrink memory mapping too other than munmap(). So,
it may hold write mmap_sem for long time when shrinking large mapping, as
what commit ("mm: mmap: zap pages with read mmap_sem in munmap")
described.
The brk() will not manipulate vmas anymore after __do_munmap() call for
the mapping shrink use case. But, it may set mm->brk after __do_munmap(),
which needs hold write mmap_sem.
However, a simple trick can workaround this by setting mm->brk before
__do_munmap(). Then restore the original value if __do_munmap() fails.
With this trick, it is safe to downgrade to read mmap_sem.
So, the same optimization, which downgrades mmap_sem to read for zapping
pages, is also feasible and reasonable to this case.
The period of holding exclusive mmap_sem for shrinking large mapping would
be reduced significantly with this optimization.
[akpm@linux-foundation.org: tweak comment]
[yang.shi@linux.alibaba.com: fix unsigned compare against 0 issue]
Link: http://lkml.kernel.org/r/1538687672-17795-1-git-send-email-yang.shi@linux.alibaba.com
Link: http://lkml.kernel.org/r/1538067582-60038-2-git-send-email-yang.shi@linux.alibaba.com
Signed-off-by: Yang Shi <yang.shi@linux.alibaba.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Laurent Dufour <ldufour@linux.vnet.ibm.com>
Cc: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'LICENSES')
0 files changed, 0 insertions, 0 deletions