| Commit message (Collapse) | Author | Age | Files | Lines | |
|---|---|---|---|---|---|
| * | FROMLIST: mm: mmap: Add new /proc tunable for mmap_base ASLR. | dcashman | 2016-09-10 | 1 | -0/+11 |
| | | | | | | | | | | | | | | | | | | (cherry picked from commit https://lkml.org/lkml/2015/12/21/337) ASLR only uses as few as 8 bits to generate the random offset for the mmap base address on 32 bit architectures. This value was chosen to prevent a poorly chosen value from dividing the address space in such a way as to prevent large allocations. This may not be an issue on all platforms. Allow the specification of a minimum number of bits so that platforms desiring greater ASLR protection may determine where to place the trade-off. Bug: 24047224 Signed-off-by: Daniel Cashman <dcashman@android.com> Signed-off-by: Daniel Cashman <dcashman@google.com> Change-Id: I66ac01c6f4f2c8dcfc84d1f1e99490b8385b3ed4 | ||||
| * | mm: don't use compound_head() in virt_to_head_page() | Joonsoo Kim | 2016-08-26 | 1 | -1/+26 |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | compound_head() is implemented with assumption that there would be race condition when checking tail flag. This assumption is only true when we try to access arbitrary positioned struct page. The situation that virt_to_head_page() is called is different case. We call virt_to_head_page() only in the range of allocated pages, so there is no race condition on tail flag. In this case, we don't need to handle race condition and we can reduce overhead slightly. This patch implements compound_head_fast() which is similar with compound_head() except tail flag race handling. And then, virt_to_head_page() uses this optimized function to improve performance. I saw 1.8% win in a fast-path loop over kmem_cache_alloc/free, (14.063 ns -> 13.810 ns) if target object is on tail page. Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com> Acked-by: Christoph Lameter <cl@linux.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: David Rientjes <rientjes@google.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Stefan Guendhoer <stefan@guendhoer.com> | ||||
| * | mm: reduce readahead from 1024kB to 512kB | Stefan Guendhoer | 2016-08-26 | 1 | -1/+1 |
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| * | 3.10.75 -> 3.10.76 | Jan Engelmohr | 2016-08-26 | 1 | -2/+3 |
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| * | first commit | Meizu OpenSource | 2016-08-15 | 1 | -0/+1855 |
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