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x86, fpu: drop the fpu state during thread exit

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There is no need to save any active fpu state to the task structure
memory if the task is dead. Just drop the state instead.

For example, this saved some 1770 xsave's during the system boot
of a two socket Xeon system.

Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Link: http://lkml.kernel.org/r/1336692811-30576-4-git-send-email-suresh.b.siddha@intel.com
Cc: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Suresh Siddha 2012-05-16 15:03:54 -07:00 committed by H. Peter Anvin
parent d75f1b391f
commit 1dcc8d7ba2
1 changed files with 13 additions and 6 deletions
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19
arch/x86/kernel/process.c
View file

@ -87,6 +87,16 @@ void arch_task_cache_init(void)
SLAB_PANIC | SLAB_NOTRACK, NULL);
}
static inline void drop_fpu(struct task_struct *tsk)
{
/*
* Forget coprocessor state..
*/
tsk->fpu_counter = 0;
clear_fpu(tsk);
clear_used_math();
}
/*
* Free current thread data structures etc..
*/
@ -109,6 +119,8 @@ void exit_thread(void)
put_cpu();
kfree(bp);
}
drop_fpu(me);
}
void show_regs(struct pt_regs *regs)
@ -149,12 +161,7 @@ void flush_thread(void)
flush_ptrace_hw_breakpoint(tsk);
memset(tsk->thread.tls_array, 0, sizeof(tsk->thread.tls_array));
/*
* Forget coprocessor state..
*/
tsk->fpu_counter = 0;
clear_fpu(tsk);
clear_used_math();
drop_fpu(tsk);
}
static void hard_disable_TSC(void)