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Commit 12600999 authored by Ingo Molnar's avatar Ingo Molnar
Browse files

x86/fpu: Improve the comment for the fpu::counter field 



This was pretty hard to read, improve it.

Reviewed-by: default avatarBorislav Petkov <bp@alien8.de>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.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>
Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent c0c2803d

arch/x86/include/asm/processor.h

+5 −5
Original line number Diff line number Diff line
@@ -435,11 +435,11 @@ struct fpu { 
	union thread_xstate *state;

	/*

	 * This counter contains the number of consecutive context switches

	 * that the FPU is used. If this is over a threshold, the lazy fpu

	 * saving becomes unlazy to save the trap. This is an unsigned char

	 * so that after 256 times the counter wraps and the behavior turns

	 * lazy again; this to deal with bursty apps that only use FPU for

	 * a short time

	 * during which the FPU stays used. If this is over a threshold, the

	 * lazy fpu saving logic becomes unlazy, to save the trap overhead.

	 * This is an unsigned char so that after 256 iterations the counter

	 * wraps and the context switch behavior turns lazy again; this is to

	 * deal with bursty apps that only use the FPU for a short time:

	 */

	unsigned char counter;

};