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x86/fpu: Improve the comment for the fpu::counter field
This was pretty hard to read, improve it. Reviewed-by: Borislav 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: Ingo Molnar <mingo@kernel.org>
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@ -435,11 +435,11 @@ struct fpu {
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union thread_xstate *state;
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/*
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* This counter contains the number of consecutive context switches
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* that the FPU is used. If this is over a threshold, the lazy fpu
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* saving becomes unlazy to save the trap. This is an unsigned char
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* so that after 256 times the counter wraps and the behavior turns
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* lazy again; this to deal with bursty apps that only use FPU for
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* a short time
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* during which the FPU stays used. If this is over a threshold, the
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* lazy fpu saving logic becomes unlazy, to save the trap overhead.
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* This is an unsigned char so that after 256 iterations the counter
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* wraps and the context switch behavior turns lazy again; this is to
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* deal with bursty apps that only use the FPU for a short time:
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*/
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unsigned char counter;
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};
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