Merge branch 'drm-fixes-4.10' of git://people.freedesktop.org/~agd5f/linux into drm-fixes - net-next.git

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author	Dave Airlie <airlied@redhat.com>	2017-02-03 09:10:08 +1000
committer	Dave Airlie <airlied@redhat.com>	2017-02-03 09:10:08 +1000
commit	f63cf464fc379382a271f94ddef36e8c5a0628eb (patch)
tree	fdf468f06fa452d40ff729d8d7901549d621c865 /sound/pci/ctxfi/Makefile
parent	a20def95401112358bcc90242f252a96084a2d47 (diff)
parent	51964e9e12d0a054002a1a0d1dec4f661c7aaf28 (diff)

Merge branch 'drm-fixes-4.10' of git://people.freedesktop.org/~agd5f/linux into drm-fixes

two amd fixes. * 'drm-fixes-4.10' of git://people.freedesktop.org/~agd5f/linux: drm/radeon: Fix vram_size/visible values in DRM_RADEON_GEM_INFO ioctl drm/amdgpu/si: fix crash on headless asics

Diffstat (limited to 'sound/pci/ctxfi/Makefile')

0 files changed, 0 insertions, 0 deletions

new primitive, but I'd rather make the name be descriptive and very clear about the limitation imposed by trying to work across all relevant architectures than make it be some generic thing that doesn't make the odd semantics explicit. So this introduces the new architecture primitive clear_bit_unlock_is_negative_byte(); and adds the trivial implementation for x86. We have a generic non-optimized fallback (that just does a "clear_bit()"+"test_bit(7)" combination) which can be overridden by any architecture that can do better. According to Nick, Power has the same hickup x86 has, for example, but some other architectures may not even care. All these optimizations mean that my page locking stress-test (which is just executing a lot of small short-lived shell scripts: "make test" in the git source tree) no longer makes our page locking look horribly bad. Before all these optimizations, just the unlock_page() costs were just over 3% of all CPU overhead on "make test". After this, it's down to 0.66%, so just a quarter of the cost it used to be. (The difference on NUMA is bigger, but there this micro-optimization is likely less noticeable, since the big issue on NUMA was not the accesses to 'struct page', but the waitqueue accesses that were already removed by Nick's earlier commit). Acked-by: Nick Piggin <npiggin@gmail.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Bob Peterson <rpeterso@redhat.com> Cc: Steven Whitehouse <swhiteho@redhat.com> Cc: Andrew Lutomirski <luto@kernel.org> Cc: Andreas Gruenbacher <agruenba@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Mel Gorman <mgorman@techsingularity.net> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Diffstat (limited to 'net/9p')


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