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ad0b0fd554
Andrew had some suggestions for the latencytop file; this patch takes care of most of these: * Add documentation * Turn account_scheduler_latency into an inline function * Don't report negative values to userspace * Make the file operations struct const * Fix a few checkpatch.pl warnings Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
52 lines
1 KiB
C
52 lines
1 KiB
C
/*
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* latencytop.h: Infrastructure for displaying latency
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*
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* (C) Copyright 2008 Intel Corporation
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* Author: Arjan van de Ven <arjan@linux.intel.com>
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*
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*/
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#ifndef _INCLUDE_GUARD_LATENCYTOP_H_
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#define _INCLUDE_GUARD_LATENCYTOP_H_
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#include <linux/compiler.h>
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#ifdef CONFIG_LATENCYTOP
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#define LT_SAVECOUNT 32
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#define LT_BACKTRACEDEPTH 12
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struct latency_record {
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unsigned long backtrace[LT_BACKTRACEDEPTH];
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unsigned int count;
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unsigned long time;
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unsigned long max;
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};
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struct task_struct;
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extern int latencytop_enabled;
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void __account_scheduler_latency(struct task_struct *task, int usecs, int inter);
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static inline void
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account_scheduler_latency(struct task_struct *task, int usecs, int inter)
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{
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if (unlikely(latencytop_enabled))
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__account_scheduler_latency(task, usecs, inter);
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}
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void clear_all_latency_tracing(struct task_struct *p);
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#else
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static inline void
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account_scheduler_latency(struct task_struct *task, int usecs, int inter)
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{
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}
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static inline void clear_all_latency_tracing(struct task_struct *p)
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{
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}
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#endif
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#endif
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