Nicholas Piggin 2a06bf3e95 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

2021-02-09 00:02:12 +11:00

..

Makefile

powerpc/signal: Don't manage floating point regs when no FPU

2020-12-04 01:01:11 +11:00

ptrace32.c

powerpc/ptrace: Move declaration of ptrace_get_reg() and ptrace_set_reg()

2020-12-04 01:01:11 +11:00

ptrace-adv.c

…

ptrace-altivec.c

…

ptrace-decl.h

powerpc/signal: Don't manage floating point regs when no FPU

2020-12-04 01:01:11 +11:00

ptrace-fpu.c

powerpc/ptrace: Create ptrace_get_fpr() and ptrace_put_fpr()

2020-12-04 01:01:11 +11:00

ptrace-noadv.c

powerpc/watchpoint/ptrace: Introduce PPC_DEBUG_FEATURE_DATA_BP_ARCH_31

2020-09-15 22:13:20 +10:00

ptrace-novsx.c

…

ptrace-spe.c

…

ptrace-tm.c

powerpc/ptrace: Hard wire PT_SOFTE value to 1 in gpr_get() too

2020-11-26 22:05:42 +11:00

ptrace-view.c

powerpc/ptrace-view: Use pt_regs values instead of thread_struct based one.

2020-12-04 01:01:26 +11:00

ptrace-vsx.c

…

ptrace.c

powerpc/64: context tracking remove _TIF_NOHZ

2021-02-09 00:02:12 +11:00