| Message ID | df05d53eed1210cf1aa76d1fb44aa0fab29c018e.1608488286.git.christophe.leroy@csgroup.eu (mailing list archive) |
|---|---|
| State | Accepted |
| Commit | 0faa22f09caadc11af2aa7570870ebd2ac5b8170 |
| Headers | show |
| Series | powerpc/time: Force inlining of get_tb() | expand |
On Sun, 20 Dec 2020 18:18:26 +0000 (UTC), Christophe Leroy wrote: > Force inlining of get_tb() in order to avoid getting > following function in vdso32, leading to suboptimal > performance in clock_gettime() > > 00000688 <.get_tb>: > 688: 7c 6d 42 a6 mftbu r3 > 68c: 7c 8c 42 a6 mftb r4 > 690: 7d 2d 42 a6 mftbu r9 > 694: 7c 03 48 40 cmplw r3,r9 > 698: 40 e2 ff f0 bne+ 688 <.get_tb> > 69c: 4e 80 00 20 blr Applied to powerpc/fixes. [1/1] powerpc/time: Force inlining of get_tb() https://git.kernel.org/powerpc/c/0faa22f09caadc11af2aa7570870ebd2ac5b8170 cheers
diff --git a/arch/powerpc/include/asm/vdso/timebase.h b/arch/powerpc/include/asm/vdso/timebase.h index b558b07959ce..881f655caa0a 100644 --- a/arch/powerpc/include/asm/vdso/timebase.h +++ b/arch/powerpc/include/asm/vdso/timebase.h @@ -49,7 +49,7 @@ static inline unsigned long get_tbl(void) return mftb(); } -static inline u64 get_tb(void) +static __always_inline u64 get_tb(void) { unsigned int tbhi, tblo, tbhi2;
Force inlining of get_tb() in order to avoid getting following function in vdso32, leading to suboptimal performance in clock_gettime() 00000688 <.get_tb>: 688: 7c 6d 42 a6 mftbu r3 68c: 7c 8c 42 a6 mftb r4 690: 7d 2d 42 a6 mftbu r9 694: 7c 03 48 40 cmplw r3,r9 698: 40 e2 ff f0 bne+ 688 <.get_tb> 69c: 4e 80 00 20 blr Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> --- arch/powerpc/include/asm/vdso/timebase.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)