diff options
| author | Stewart Smith <stewart@linux.vnet.ibm.com> | 2015-05-29 16:49:41 +1000 |
|---|---|---|
| committer | Stewart Smith <stewart@linux.vnet.ibm.com> | 2015-05-29 16:49:41 +1000 |
| commit | 9daee5c3edab395b6a2e729b3fe3728dbc7e4bf6 (patch) | |
| tree | 4b152274bbfb735b8eb54d3e5fd8c1a02238686c /include | |
| parent | 067852584a7c8f0cecfdf1d3295b9de5dff07215 (diff) | |
| download | skiboot-9daee5c3edab395b6a2e729b3fe3728dbc7e4bf6.zip skiboot-9daee5c3edab395b6a2e729b3fe3728dbc7e4bf6.tar.gz skiboot-9daee5c3edab395b6a2e729b3fe3728dbc7e4bf6.tar.bz2 | |
Make cpu_relax() inline
This modifies code output when built with GCOV so that the store of counter
data is out of some of the loops, thus improving things when built with gcov.
Also, likely makes us do even less work when relaxing, so probably a good
thing.
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/cpu.h | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/include/cpu.h b/include/cpu.h index 2bf15ea..d2c1825 100644 --- a/include/cpu.h +++ b/include/cpu.h @@ -102,7 +102,17 @@ extern unsigned int cpu_thread_count; /* Boot CPU. */ extern struct cpu_thread *boot_cpu; -extern void cpu_relax(void); +static inline void __nomcount cpu_relax(void) +{ + /* Relax a bit to give sibling threads some breathing space */ + smt_low(); + smt_very_low(); + asm volatile("nop; nop; nop; nop;\n" + "nop; nop; nop; nop;\n" + "nop; nop; nop; nop;\n" + "nop; nop; nop; nop;\n"); + smt_medium(); +} /* Initialize CPUs */ void pre_init_boot_cpu(void); |