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authorIngo Molnar <mingo@elte.hu>2009-02-25 08:22:20 +0100
committerIngo Molnar <mingo@elte.hu>2009-02-25 10:20:05 +0100
commit95108fa34a83ffd97e0af959e4b28d7c62008781 (patch)
tree06577270f81166d67b9058be1c04812b1ccf1058 /mm/vmalloc.c
parent3255aa2eb636a508fc82a73fabbb8aaf2ff23c0f (diff)
x86: usercopy: check for total size when deciding non-temporal cutoff
Impact: make more types of copies non-temporal This change makes the following simple fix: 30d697f: x86: fix performance regression in write() syscall A bit more sophisticated: we check the 'total' number of bytes written to decide whether to copy in a cached or a non-temporal way. This will for example cause the tail (modulo 4096 bytes) chunk of a large write() to be non-temporal too - not just the page-sized chunks. Cc: Salman Qazi <sqazi@google.com> Cc: Nick Piggin <npiggin@suse.de> Cc: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'mm/vmalloc.c')
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