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author | Vlastimil Babka <vbabka@suse.cz> | 2018-08-18 01:44:44 +0300 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-08-18 02:20:28 +0300 |
commit | 0882ff9190e3bc51e2d78c3aadd7c690eeaa91d5 (patch) | |
tree | a312187c110196abe88491dc2cb4f3228096a3c6 /Documentation/leds | |
parent | 1f4aace60b0edc2d885aaa263abf4df42c8c65a8 (diff) | |
download | linux-0882ff9190e3bc51e2d78c3aadd7c690eeaa91d5.tar.xz |
mm, slub: restore the original intention of prefetch_freepointer()
In SLUB, prefetch_freepointer() is used when allocating an object from
cache's freelist, to make sure the next object in the list is cache-hot,
since it's probable it will be allocated soon.
Commit 2482ddec670f ("mm: add SLUB free list pointer obfuscation") has
unintentionally changed the prefetch in a way where the prefetch is
turned to a real fetch, and only the next->next pointer is prefetched.
In case there is not a stream of allocations that would benefit from
prefetching, the extra real fetch might add a useless cache miss to the
allocation. Restore the previous behavior.
Link: http://lkml.kernel.org/r/20180809085245.22448-1-vbabka@suse.cz
Fixes: 2482ddec670f ("mm: add SLUB free list pointer obfuscation")
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Kees Cook <keescook@chromium.org>
Cc: Daniel Micay <danielmicay@gmail.com>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/leds')
0 files changed, 0 insertions, 0 deletions