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| author | Kirill A. Shutemov <kirill.shutemov@linux.intel.com> | 2013-11-14 14:31:53 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-11-15 09:32:20 +0900 |
| commit | ea1e7ed33708c7a760419ff9ded0a6cb90586a50 (patch) | |
| tree | 553c0c4024639bf2b1706d144fd6bb8ada63861e /fs/ioprio.c | |
| parent | 539edb5846c740d78a8b6c2e43a99ca4323df68f (diff) | |
| download | blackbird-op-linux-ea1e7ed33708c7a760419ff9ded0a6cb90586a50.tar.gz blackbird-op-linux-ea1e7ed33708c7a760419ff9ded0a6cb90586a50.zip | |
mm: create a separate slab for page->ptl allocation
If DEBUG_SPINLOCK and DEBUG_LOCK_ALLOC are enabled spinlock_t on x86_64
is 72 bytes. For page->ptl they will be allocated from kmalloc-96 slab,
so we loose 24 on each. An average system can easily allocate few tens
thousands of page->ptl and overhead is significant.
Let's create a separate slab for page->ptl allocation to solve this.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/ioprio.c')
0 files changed, 0 insertions, 0 deletions
