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| author |   Ingo Molnar <mingo@kernel.org> | 2015-07-17 12:28:12 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-07-18 03:42:51 +0200 |
| commit | 5aaeb5c01c5b6c0be7b7aadbf3ace9f3a4458c3d (patch) | |
| tree | 8cf45cdd6647d1067d94aaad64598a7728f15d6b /include/linux | |
| parent | x86/fpu, sched: Dynamically allocate 'struct fpu' (diff) | |
| download | linux-dev-5aaeb5c01c5b6c0be7b7aadbf3ace9f3a4458c3d.tar.xz linux-dev-5aaeb5c01c5b6c0be7b7aadbf3ace9f3a4458c3d.zip | |
x86/fpu, sched: Introduce CONFIG_ARCH_WANTS_DYNAMIC_TASK_STRUCT and use it on x86
Don't burden architectures without dynamic task_struct sizing
with the overhead of dynamic sizing.
Also optimize the x86 code a bit by caching task_struct_size.
Acked-and-Tested-by: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dave Hansen <dave@sr71.net>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1437128892-9831-3-git-send-email-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/sched.h | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h index e43a41d892b6..04b5ada460b4 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -1786,7 +1786,11 @@ struct task_struct { */ }; -extern int arch_task_struct_size(void); +#ifdef CONFIG_ARCH_WANTS_DYNAMIC_TASK_STRUCT +extern int arch_task_struct_size __read_mostly; +#else +# define arch_task_struct_size (sizeof(struct task_struct)) +#endif /* Future-safe accessor for struct task_struct's cpus_allowed. */ #define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed) |