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e02c9b0d65
The name clear_all_latency_tracing is misleading, in fact which only clear per task's latency_record[], and we do have another function named clear_global_latency_tracing which clear the global latency_record[] buffer. Link: http://lkml.kernel.org/r/20190226114602.16902-1-linf@wangsu.com Signed-off-by: Lin Feng <linf@wangsu.com> Cc: Alexey Dobriyan <adobriyan@gmail.com> Cc: Fabian Frederick <fabf@skynet.be> Cc: Arjan van de Ven <arjan@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
58 lines
1.2 KiB
C
58 lines
1.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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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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struct task_struct;
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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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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_tsk_latency_tracing(struct task_struct *p);
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extern int sysctl_latencytop(struct ctl_table *table, int write,
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void __user *buffer, size_t *lenp, loff_t *ppos);
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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_tsk_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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