diff options
| author | Frederic Weisbecker <frederic@kernel.org> | 2019-11-21 05:44:26 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2019-11-21 09:33:24 +0300 |
| commit | 74722bb223d0f236303b60c9509ff924a9713780 (patch) | |
| tree | 8e29d87890a00e4377b0296f712c1e52ab1f0d7d /include/linux/kernel_stat.h | |
| parent | 5a1c95580f1d89c8a736bb02ecd82a8858388b8a (diff) | |
| download | linux-74722bb223d0f236303b60c9509ff924a9713780.tar.xz | |
sched/vtime: Bring up complete kcpustat accessor
Many callsites want to fetch the values of system, user, user_nice, guest
or guest_nice kcpustat fields altogether or at least a pair of these.
In that case calling kcpustat_field() for each requested field brings
unecessary overhead when we could fetch all of them in a row.
So provide kcpustat_cpu_fetch() that fetches the whole kcpustat array
in a vtime safe way under the same RCU and seqcount block.
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Wanpeng Li <wanpengli@tencent.com>
Cc: Yauheni Kaliuta <yauheni.kaliuta@redhat.com>
Link: https://lkml.kernel.org/r/20191121024430.19938-3-frederic@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/linux/kernel_stat.h')
| -rw-r--r-- | include/linux/kernel_stat.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/kernel_stat.h b/include/linux/kernel_stat.h index 79781196eb25..89f0745c096d 100644 --- a/include/linux/kernel_stat.h +++ b/include/linux/kernel_stat.h @@ -81,12 +81,19 @@ static inline unsigned int kstat_cpu_irqs_sum(unsigned int cpu) #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN extern u64 kcpustat_field(struct kernel_cpustat *kcpustat, enum cpu_usage_stat usage, int cpu); +extern void kcpustat_cpu_fetch(struct kernel_cpustat *dst, int cpu); #else static inline u64 kcpustat_field(struct kernel_cpustat *kcpustat, enum cpu_usage_stat usage, int cpu) { return kcpustat->cpustat[usage]; } + +static inline void kcpustat_cpu_fetch(struct kernel_cpustat *dst, int cpu) +{ + *dst = kcpustat_cpu(cpu); +} + #endif extern void account_user_time(struct task_struct *, u64); |