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Avoid a system call in 'gettid'.

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System calls can be pretty slow. This is mako, which has one of our
lowest latencies:

                       iterations      ns/op
  BM_unistd_getpid       10000000        209
  BM_unistd_gettid      200000000          8

Bug: 15297299 (kernel panic from too many gettid calls)
Bug: 15315766 (excessive gettid overhead in liblogd)
Change-Id: I49656c0fc5b5d092390264a59e4f2c0d8a8b1aeb
This commit is contained in:
Elliott Hughes
2014-05-30 19:00:03 -07:00
parent 831405b749
commit 5d9a7ba0dc
10 changed files with 47 additions and 117 deletions
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19
libc/arch-mips/syscalls/gettid.S
View File

@@ -1,19 +0,0 @@
/* Generated by gensyscalls.py. Do not edit. */
#include <private/bionic_asm.h>
ENTRY(gettid)
.set noreorder
.cpload t9
li v0, __NR_gettid
syscall
bnez a3, 1f
move a0, v0
j ra
nop
1:
la t9,__set_errno
j t9
nop
.set reorder
END(gettid)