Pekka Enberg a écrit :
On 3/19/07, Andrew Morton <[EMAIL PROTECTED]> wrote:
This is a super-hot path.
Super-hot exactly where?
Don't be silly Pekka ... We have plenty oprofiles results if you dont trust
Andrew.
CPU: AMD64 processors, speed 1992.52 MHz (estimated)
Counted CPU_CLK_UNHALTED events (Cycles outside of halt state) with a unit
mask of 0x00 (No unit mask) count 100000
samples % symbol name
1861563 4.7882 tg3_start_xmit_dma_bug
1375727 3.5386 memcpy_c
1166438 3.0002 tcp_v4_rcv
1157334 2.9768 kmem_cache_free
In this workload (real server), you can see kmem_cache_free() is number four.
Adding one test and conditional branch in this super-hot function just to
correct a bug in a SCSI driver (or whatever) is not *SANE*.
Numbers talk.
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