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| author | Thomas Gleixner <tglx@linutronix.de> | 2022-09-15 13:11:01 +0200 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2022-10-17 16:41:03 +0200 |
| commit | e57ef2ed97c1d078973298658a8096644a1e9e09 (patch) | |
| tree | 79cb9a8835ab832a8e8c302abf1ffe0c0ad96c5f /arch/x86/kernel/process_64.c | |
| parent | fdc9ee7e97aa2c1dfa7ebb092fffec40ffa59108 (diff) | |
| download | linux-stable-e57ef2ed97c1d078973298658a8096644a1e9e09.tar.gz linux-stable-e57ef2ed97c1d078973298658a8096644a1e9e09.tar.bz2 linux-stable-e57ef2ed97c1d078973298658a8096644a1e9e09.zip | |
x86: Put hot per CPU variables into a struct
The layout of per-cpu variables is at the mercy of the compiler. This
can lead to random performance fluctuations from build to build.
Create a structure to hold some of the hottest per-cpu variables,
starting with current_task.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20220915111145.179707194@infradead.org
Diffstat (limited to 'arch/x86/kernel/process_64.c')
| -rw-r--r-- | arch/x86/kernel/process_64.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c index 6b3418bff326..c4f6cacf6599 100644 --- a/arch/x86/kernel/process_64.c +++ b/arch/x86/kernel/process_64.c @@ -617,7 +617,7 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p) /* * Switch the PDA and FPU contexts. */ - this_cpu_write(current_task, next_p); + raw_cpu_write(pcpu_hot.current_task, next_p); this_cpu_write(cpu_current_top_of_stack, task_top_of_stack(next_p)); switch_fpu_finish(); |