/* CacheFiles statistics * * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. * Written by David Howells (dhowells@redhat.com) * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public Licence * as published by the Free Software Foundation; either version * 2 of the Licence, or (at your option) any later version. */ #include #include #include #include "internal.h" atomic_t cachefiles_lookup_histogram[HZ]; atomic_t cachefiles_mkdir_histogram[HZ]; atomic_t cachefiles_create_histogram[HZ]; /* * display the latency histogram */ static int cachefiles_histogram_show(struct seq_file *m, void *v) { unsigned long index; unsigned x, y, z, t; switch ((unsigned long) v) { case 1: seq_puts(m, "JIFS SECS LOOKUPS MKDIRS CREATES\n"); return 0; case 2: seq_puts(m, "===== ===== ========= ========= =========\n"); return 0; default: index = (unsigned long) v - 3; x = atomic_read(&cachefiles_lookup_histogram[index]); y = atomic_read(&cachefiles_mkdir_histogram[index]); z = atomic_read(&cachefiles_create_histogram[index]); if (x == 0 && y == 0 && z == 0) return 0; t = (index * 1000) / HZ; seq_printf(m, "%4lu 0.%03u %9u %9u %9u\n", index, t, x, y, z); return 0; } } /* * set up the iterator to start reading from the first line */ static void *cachefiles_histogram_start(struct seq_file *m, loff_t *_pos) { if ((unsigned long long)*_pos >= HZ + 2) return NULL; if (*_pos == 0) *_pos = 1; return (void *)(unsigned long) *_pos; } /* * move to the next line */ static void *cachefiles_histogram_next(struct seq_file *m, void *v, loff_t *pos) { (*pos)++; return (unsigned long long)*pos > HZ + 2 ? NULL : (void *)(unsigned long) *pos; } /* * clean up after reading */ static void cachefiles_histogram_stop(struct seq_file *m, void *v) { } static const struct seq_operations cachefiles_histogram_ops = { .start = cachefiles_histogram_start, .stop = cachefiles_histogram_stop, .next = cachefiles_histogram_next, .show = cachefiles_histogram_show, }; /* * open "/proc/fs/cachefiles/XXX" which provide statistics summaries */ static int cachefiles_histogram_open(struct inode *inode, struct file *file) { return seq_open(file, &cachefiles_histogram_ops); } static const struct file_operations cachefiles_histogram_fops = { .open = cachefiles_histogram_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release, }; /* * initialise the /proc/fs/cachefiles/ directory */ int __init cachefiles_proc_init(void) { _enter(""); if (!proc_mkdir("fs/cachefiles", NULL)) goto error_dir; if (!proc_create("fs/cachefiles/histogram", S_IFREG | 0444, NULL, &cachefiles_histogram_fops)) goto error_histogram; _leave(" = 0"); return 0; error_histogram: remove_proc_entry("fs/cachefiles", NULL); error_dir: _leave(" = -ENOMEM"); return -ENOMEM; } /* * clean up the /proc/fs/cachefiles/ directory */ void cachefiles_proc_cleanup(void) { remove_proc_entry("fs/cachefiles/histogram", NULL); remove_proc_entry("fs/cachefiles", NULL); } 9b25'>Kconfig
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authorThomas Gleixner <tglx@linutronix.de>2017-01-31 09:37:34 +0100
committerThomas Gleixner <tglx@linutronix.de>2017-01-31 21:47:58 +0100
commit0becc0ae5b42828785b589f686725ff5bc3b9b25 (patch)
treebe6d0e1f37c38ed0a7dd5da2d4b1e93f0fb43101 /net/nfc/hci/Kconfig
parent24c2503255d35c269b67162c397a1a1c1e02f6ce (diff)
x86/mce: Make timer handling more robust
Erik reported that on a preproduction hardware a CMCI storm triggers the BUG_ON in add_timer_on(). The reason is that the per CPU MCE timer is started by the CMCI logic before the MCE CPU hotplug callback starts the timer with add_timer_on(). So the timer is already queued which triggers the BUG. Using add_timer_on() is pretty pointless in this code because the timer is strictlty per CPU, initialized as pinned and all operations which arm the timer happen on the CPU to which the timer belongs. Simplify the whole machinery by using mod_timer() instead of add_timer_on() which avoids the problem because mod_timer() can handle already queued timers. Use __start_timer() everywhere so the earliest armed expiry time is preserved. Reported-by: Erik Veijola <erik.veijola@intel.com> Tested-by: Borislav Petkov <bp@alien8.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Borislav Petkov <bp@alien8.de> Cc: Tony Luck <tony.luck@intel.com> Link: http://lkml.kernel.org/r/alpine.DEB.2.20.1701310936080.3457@nanos Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'net/nfc/hci/Kconfig')