From b5e64b3de7fdd1db0a12871f7114fc1da899df8e Mon Sep 17 00:00:00 2001 From: Martin Schwidefsky Date: Mon, 2 Dec 2013 14:54:56 +0100 Subject: s390/vdso: ectg gettime support for CLOCK_THREAD_CPUTIME_ID The code to use the ECTG instruction to calculate the cputime for the current thread is currently used only for the per-thread CPU-clock with the clockid -2 (PID=0, VIRT=1). Use the same code for the clockid CLOCK_THREAD_CPUTIME_ID to speed up the more common clockid as well. Reported-by: Heiko Carstens Signed-off-by: Martin Schwidefsky diff --git a/arch/s390/kernel/asm-offsets.c b/arch/s390/kernel/asm-offsets.c index 496116c..e4c99a1 100644 --- a/arch/s390/kernel/asm-offsets.c +++ b/arch/s390/kernel/asm-offsets.c @@ -72,6 +72,7 @@ int main(void) /* constants used by the vdso */ DEFINE(__CLOCK_REALTIME, CLOCK_REALTIME); DEFINE(__CLOCK_MONOTONIC, CLOCK_MONOTONIC); + DEFINE(__CLOCK_THREAD_CPUTIME_ID, CLOCK_THREAD_CPUTIME_ID); DEFINE(__CLOCK_REALTIME_RES, MONOTONIC_RES_NSEC); BLANK(); /* idle data offsets */ diff --git a/arch/s390/kernel/vdso64/clock_getres.S b/arch/s390/kernel/vdso64/clock_getres.S index 176e1f7..34deba7 100644 --- a/arch/s390/kernel/vdso64/clock_getres.S +++ b/arch/s390/kernel/vdso64/clock_getres.S @@ -23,7 +23,9 @@ __kernel_clock_getres: je 0f cghi %r2,__CLOCK_MONOTONIC je 0f - cghi %r2,-2 /* CLOCK_THREAD_CPUTIME_ID for this thread */ + cghi %r2,__CLOCK_THREAD_CPUTIME_ID + je 0f + cghi %r2,-2 /* Per-thread CPUCLOCK with PID=0, VIRT=1 */ jne 2f larl %r5,_vdso_data icm %r0,15,__LC_ECTG_OK(%r5) diff --git a/arch/s390/kernel/vdso64/clock_gettime.S b/arch/s390/kernel/vdso64/clock_gettime.S index 0add107..4007007 100644 --- a/arch/s390/kernel/vdso64/clock_gettime.S +++ b/arch/s390/kernel/vdso64/clock_gettime.S @@ -22,7 +22,9 @@ __kernel_clock_gettime: larl %r5,_vdso_data cghi %r2,__CLOCK_REALTIME je 4f - cghi %r2,-2 /* CLOCK_THREAD_CPUTIME_ID for this thread */ + cghi %r2,__CLOCK_THREAD_CPUTIME_ID + je 9f + cghi %r2,-2 /* Per-thread CPUCLOCK with PID=0, VIRT=1 */ je 9f cghi %r2,__CLOCK_MONOTONIC jne 12f -- cgit v0.10.2