/* FS-Cache statistics viewing interface * * 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 License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #define FSCACHE_DEBUG_LEVEL OPERATION #include #include #include #include "internal.h" /* * initialise the /proc/fs/fscache/ directory */ int __init fscache_proc_init(void) { _enter(""); if (!proc_mkdir("fs/fscache", NULL)) goto error_dir; #ifdef CONFIG_FSCACHE_STATS if (!proc_create("fs/fscache/stats", S_IFREG | 0444, NULL, &fscache_stats_fops)) goto error_stats; #endif #ifdef CONFIG_FSCACHE_HISTOGRAM if (!proc_create("fs/fscache/histogram", S_IFREG | 0444, NULL, &fscache_histogram_fops)) goto error_histogram; #endif #ifdef CONFIG_FSCACHE_OBJECT_LIST if (!proc_create("fs/fscache/objects", S_IFREG | 0444, NULL, &fscache_objlist_fops)) goto error_objects; #endif _leave(" = 0"); return 0; #ifdef CONFIG_FSCACHE_OBJECT_LIST error_objects: #endif #ifdef CONFIG_FSCACHE_HISTOGRAM remove_proc_entry("fs/fscache/histogram", NULL); error_histogram: #endif #ifdef CONFIG_FSCACHE_STATS remove_proc_entry("fs/fscache/stats", NULL); error_stats: #endif remove_proc_entry("fs/fscache", NULL); error_dir: _leave(" = -ENOMEM"); return -ENOMEM; } /* * clean up the /proc/fs/fscache/ directory */ void fscache_proc_cleanup(void) { #ifdef CONFIG_FSCACHE_OBJECT_LIST remove_proc_entry("fs/fscache/objects", NULL); #endif #ifdef CONFIG_FSCACHE_HISTOGRAM remove_proc_entry("fs/fscache/histogram", NULL); #endif #ifdef CONFIG_FSCACHE_STATS remove_proc_entry("fs/fscache/stats", NULL); #endif remove_proc_entry("fs/fscache", NULL); } 6cae7'>treecommitdiff
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authorSteven Rostedt (VMware) <rostedt@goodmis.org>2017-01-30 19:27:10 -0500
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2017-01-31 09:13:49 -0500
commit79c6f448c8b79c321e4a1f31f98194e4f6b6cae7 (patch)
tree370efda701f03cccf21e02bb1fdd3b852547d75c /tools/include
parent0c744ea4f77d72b3dcebb7a8f2684633ec79be88 (diff)
tracing: Fix hwlat kthread migration
The hwlat tracer creates a kernel thread at start of the tracer. It is pinned to a single CPU and will move to the next CPU after each period of running. If the user modifies the migration thread's affinity, it will not change after that happens. The original code created the thread at the first instance it was called, but later was changed to destroy the thread after the tracer was finished, and would not be created until the next instance of the tracer was established. The code that initialized the affinity was only called on the initial instantiation of the tracer. After that, it was not initialized, and the previous affinity did not match the current newly created one, making it appear that the user modified the thread's affinity when it did not, and the thread failed to migrate again. Cc: stable@vger.kernel.org Fixes: 0330f7aa8ee6 ("tracing: Have hwlat trace migrate across tracing_cpumask CPUs") Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'tools/include')