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| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2014-08-29 14:31:45 +0400 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2014-09-09 10:53:27 +0400 |
| commit | b7eacb59cd7fb5e98852186e485c0c865f862645 (patch) | |
| tree | 79020288a93eb3abfa3de29c44735958e7c3655e /arch/s390/kernel/vdso64 | |
| parent | 070b7be633dc33c0899e8c934b4d5fad046b06e8 (diff) | |
| download | linux-b7eacb59cd7fb5e98852186e485c0c865f862645.tar.xz | |
s390/vdso: add vdso support for coarse clocks
Add CLOCK_REALTIME_COARSE and CLOCK_MONOTONIC_COARSE optimization to
the 64-bit and 31-bit vdso.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel/vdso64')
| -rw-r--r-- | arch/s390/kernel/vdso64/clock_getres.S | 8 | ||||
| -rw-r--r-- | arch/s390/kernel/vdso64/clock_gettime.S | 24 |
2 files changed, 31 insertions, 1 deletions
diff --git a/arch/s390/kernel/vdso64/clock_getres.S b/arch/s390/kernel/vdso64/clock_getres.S index 34deba7c7ed1..c8513deb8c66 100644 --- a/arch/s390/kernel/vdso64/clock_getres.S +++ b/arch/s390/kernel/vdso64/clock_getres.S @@ -19,6 +19,12 @@ .type __kernel_clock_getres,@function __kernel_clock_getres: .cfi_startproc + larl %r1,4f + cghi %r2,__CLOCK_REALTIME_COARSE + je 0f + cghi %r2,__CLOCK_MONOTONIC_COARSE + je 0f + larl %r1,3f cghi %r2,__CLOCK_REALTIME je 0f cghi %r2,__CLOCK_MONOTONIC @@ -32,7 +38,6 @@ __kernel_clock_getres: jz 2f 0: ltgr %r3,%r3 jz 1f /* res == NULL */ - larl %r1,3f lg %r0,0(%r1) xc 0(8,%r3),0(%r3) /* set tp->tv_sec to zero */ stg %r0,8(%r3) /* store tp->tv_usec */ @@ -42,5 +47,6 @@ __kernel_clock_getres: svc 0 br %r14 3: .quad __CLOCK_REALTIME_RES +4: .quad __CLOCK_COARSE_RES .cfi_endproc .size __kernel_clock_getres,.-__kernel_clock_getres diff --git a/arch/s390/kernel/vdso64/clock_gettime.S b/arch/s390/kernel/vdso64/clock_gettime.S index 4add40b78ed5..9d9761f8e110 100644 --- a/arch/s390/kernel/vdso64/clock_gettime.S +++ b/arch/s390/kernel/vdso64/clock_gettime.S @@ -20,12 +20,16 @@ __kernel_clock_gettime: .cfi_startproc larl %r5,_vdso_data + cghi %r2,__CLOCK_REALTIME_COARSE + je 4f cghi %r2,__CLOCK_REALTIME je 5f 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_COARSE + je 3f cghi %r2,__CLOCK_MONOTONIC jne 12f @@ -54,6 +58,26 @@ __kernel_clock_gettime: lghi %r2,0 br %r14 + /* CLOCK_MONOTONIC_COARSE */ +3: lg %r4,__VDSO_UPD_COUNT(%r5) /* load update counter */ + tmll %r4,0x0001 /* pending update ? loop */ + jnz 3b + lg %r0,__VDSO_WTOM_CRS_SEC(%r5) + lg %r1,__VDSO_WTOM_CRS_NSEC(%r5) + clg %r4,__VDSO_UPD_COUNT(%r5) /* check update counter */ + jne 3b + j 2b + + /* CLOCK_REALTIME_COARSE */ +4: lg %r4,__VDSO_UPD_COUNT(%r5) /* load update counter */ + tmll %r4,0x0001 /* pending update ? loop */ + jnz 4b + lg %r0,__VDSO_XTIME_CRS_SEC(%r5) + lg %r1,__VDSO_XTIME_CRS_NSEC(%r5) + clg %r4,__VDSO_UPD_COUNT(%r5) /* check update counter */ + jne 4b + j 7f + /* CLOCK_REALTIME */ 5: lg %r4,__VDSO_UPD_COUNT(%r5) /* load update counter */ tmll %r4,0x0001 /* pending update ? loop */ |