summaryrefslogtreecommitdiff
path: root/inotail.h
blob: e1590df4cd44a4f873f013b1ab160996729df173 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
/*
 * Copyright (C) 2005-2006, Tobias Klauser <tklauser@distanz.ch>
 *
 * Licensed under the terms of the GNU General Public License; version 2 or later.
 */

#ifndef _INOTAIL_H
#define _INOTAIL_H

/* Number of items to tail. */
#define DEFAULT_N_LINES 10

/* tail modes */
enum { M_LINES, M_BYTES };

/* Every tailed file is represented as a file_struct */
struct file_struct {
	char *name;		/* Name of file (or '-' for stdin) */
	int fd;			/* File descriptor (or -1 if file is not open */
	off_t st_size;		/* File size */

	unsigned ignore;	/* Wheter to ignore the file in further processing */

	int i_watch;		/* Inotify watch associated with file_struct */
};

#ifdef DEBUG
# define dprintf(fmt, args...) fprintf(stderr, fmt, ##args)
#else
# define dprintf(fmt, args...)
#endif /* DEBUG */

#ifdef __GNUC__
# define unlikely(x) __builtin_expect(!!(x), 0)
#else
# define unlikely(x) (x)
#endif /* __GNUC__ */

#endif /* _INOTAIL_H */
parentf62e00cc3a00bfbd394a79fc22b334c31f91bd5f (diff)
x86,mm: make pagefault killable
When an oom killing occurs, almost all processes are getting stuck at the following two points. 1) __alloc_pages_nodemask 2) __lock_page_or_retry 1) is not very problematic because TIF_MEMDIE leads to an allocation failure and getting out from page allocator. 2) is more problematic. In an OOM situation, zones typically don't have page cache at all and memory starvation might lead to greatly reduced IO performance. When a fork bomb occurs, TIF_MEMDIE tasks don't die quickly, meaning that a fork bomb may create new process quickly rather than the oom-killer killing it. Then, the system may become livelocked. This patch makes the pagefault interruptible by SIGKILL. Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Minchan Kim <minchan.kim@gmail.com> Cc: Matthew Wilcox <willy@linux.intel.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memory_hotplug.c')