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authorSven Schnelle <svens@linux.ibm.com>2020-04-28 10:52:23 +0300
committerVasily Gorbik <gor@linux.ibm.com>2020-08-26 19:47:21 +0300
commit4bff8cb5450287e246d365b719148b2d9364c292 (patch)
tree4cc4c378f7541d4b8fd080663d2f0847a24c2cfc /arch/s390/include/asm/clocksource.h
parent98ad45fb58c14ebef6da27f91905e5b8fcff8686 (diff)
downloadlinux-4bff8cb5450287e246d365b719148b2d9364c292.tar.xz
s390: convert to GENERIC_VDSO
Convert s390 to generic vDSO. There are a few special things on s390: - vDSO can be called without a stack frame - glibc did this in the past. So we need to allocate a stackframe on our own. - The former assembly code used stcke to get the TOD clock and applied time steering to it. We need to do the same in the new code. This is done in the architecture specific __arch_get_hw_counter function. The steering information is stored in an architecure specific area in the vDSO data. - CPUCLOCK_VIRT is now handled with a syscall fallback, which might be slower/less accurate than the old implementation. The getcpu() function stays as an assembly function because there is no generic implementation and the code is just a few lines. Performance number from my system do 100 mio gettimeofday() calls: Plain syscall: 8.6s Generic VDSO: 1.3s old ASM VDSO: 1s So it's a bit slower but still much faster than syscalls. Signed-off-by: Sven Schnelle <svens@linux.ibm.com> Reviewed-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Diffstat (limited to 'arch/s390/include/asm/clocksource.h')
-rw-r--r--arch/s390/include/asm/clocksource.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/s390/include/asm/clocksource.h b/arch/s390/include/asm/clocksource.h
new file mode 100644
index 000000000000..03434369fce4
--- /dev/null
+++ b/arch/s390/include/asm/clocksource.h
@@ -0,0 +1,7 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* s390-specific clocksource additions */
+
+#ifndef _ASM_S390_CLOCKSOURCE_H
+#define _ASM_S390_CLOCKSOURCE_H
+
+#endif /* _ASM_S390_CLOCKSOURCE_H */