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| author | Nicholas Piggin <npiggin@gmail.com> | 2021-01-30 16:08:40 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2021-02-08 16:02:12 +0300 |
| commit | 2a06bf3e95cd93e3640d431960181b8e47415f33 (patch) | |
| tree | 053f9595d45c435259e0ed2e10ae78c3dc5e4833 /arch/powerpc/Kconfig | |
| parent | e6f8a6c86ce7b2108c03c1cc014fdae278573df1 (diff) | |
| download | linux-2a06bf3e95cd93e3640d431960181b8e47415f33.tar.xz | |
powerpc/64: context tracking remove _TIF_NOHZ
Add context tracking to the system call handler explicitly, and remove
_TIF_NOHZ.
This improves system call performance when nohz_full is enabled. On a
POWER9, gettid scv system call cost on a nohz_full CPU improves from
1129 cycles to 1004 cycles and on a housekeeping CPU from 550 cycles
to 430 cycles.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210130130852.2952424-31-npiggin@gmail.com
Diffstat (limited to 'arch/powerpc/Kconfig')
| -rw-r--r-- | arch/powerpc/Kconfig | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index ef64d96bf316..686829dd1c66 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -196,7 +196,6 @@ config PPC select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13) select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2) select HAVE_CONTEXT_TRACKING if PPC64 - select HAVE_TIF_NOHZ if PPC64 select HAVE_DEBUG_KMEMLEAK select HAVE_DEBUG_STACKOVERFLOW select HAVE_DYNAMIC_FTRACE |