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| author |   Nicholas Piggin <npiggin@gmail.com> | 2021-01-30 23:08:40 +1000 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2021-02-09 00:02:12 +1100 |
| commit | 2a06bf3e95cd93e3640d431960181b8e47415f33 (patch) | |
| tree | 053f9595d45c435259e0ed2e10ae78c3dc5e4833 /arch/powerpc/kernel/signal.c | |
| parent | powerpc: add interrupt_cond_local_irq_enable helper (diff) | |
| download | wireguard-linux-2a06bf3e95cd93e3640d431960181b8e47415f33.tar.xz wireguard-linux-2a06bf3e95cd93e3640d431960181b8e47415f33.zip | |
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/kernel/signal.c')
| -rw-r--r-- | arch/powerpc/kernel/signal.c | 4 |
1 files changed, 0 insertions, 4 deletions
diff --git a/arch/powerpc/kernel/signal.c b/arch/powerpc/kernel/signal.c index 53782aa60ade..9ded046edb0e 100644 --- a/arch/powerpc/kernel/signal.c +++ b/arch/powerpc/kernel/signal.c @@ -282,8 +282,6 @@ static void do_signal(struct task_struct *tsk) void do_notify_resume(struct pt_regs *regs, unsigned long thread_info_flags) { - user_exit(); - if (thread_info_flags & _TIF_UPROBE) uprobe_notify_resume(regs); @@ -299,8 +297,6 @@ void do_notify_resume(struct pt_regs *regs, unsigned long thread_info_flags) tracehook_notify_resume(regs); rseq_handle_notify_resume(NULL, regs); } - - user_enter(); } static unsigned long get_tm_stackpointer(struct task_struct *tsk) |