32927393dc
Instead of having all the sysctl handlers deal with user pointers, which is rather hairy in terms of the BPF interaction, copy the input to and from userspace in common code. This also means that the strings are always NUL-terminated by the common code, making the API a little bit safer. As most handler just pass through the data to one of the common handlers a lot of the changes are mechnical. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Andrey Ignatov <rdna@fb.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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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int sysctl_latencytop(struct ctl_table *table, int write, void *buffer,
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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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