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| author | Borislav Petkov <bp@suse.de> | 2016-08-02 14:04:04 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-08-02 19:35:06 -0400 |
| commit | 6b1d174b0c27b5de421eda55c2731f32b6bd9852 (patch) | |
| tree | 3095928a9c579090ef8db9cb6df7125ec1c638db /lib | |
| parent | b5644a153d2701ffc335cfb9ef49967bd5b6a3c2 (diff) | |
| download | lwn-6b1d174b0c27b5de421eda55c2731f32b6bd9852.tar.gz lwn-6b1d174b0c27b5de421eda55c2731f32b6bd9852.zip | |
ratelimit: extend to print suppressed messages on release
Extend the ratelimiting facility to print the amount of suppressed lines
when it is being released.
This use case is aimed at short-termed, burst-like users for which we
want to output the suppressed lines stats only once, after it has been
disposed of. For an example, see /dev/kmsg usage in a follow-on patch.
Also, change the printk() line we issue on release to not use
"callbacks" as it is misleading: we're not suppressing callbacks but
printk() calls.
This has been separated from a previous patch by Linus.
Link: http://lkml.kernel.org/r/20160716061745.15795-2-bp@alien8.de
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Dave Young <dyoung@redhat.com>
Cc: Franck Bui <fbui@suse.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/ratelimit.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/lib/ratelimit.c b/lib/ratelimit.c index 2c5de86460c5..08f8043cac61 100644 --- a/lib/ratelimit.c +++ b/lib/ratelimit.c @@ -46,12 +46,14 @@ int ___ratelimit(struct ratelimit_state *rs, const char *func) rs->begin = jiffies; if (time_is_before_jiffies(rs->begin + rs->interval)) { - if (rs->missed) - printk(KERN_WARNING "%s: %d callbacks suppressed\n", - func, rs->missed); + if (rs->missed) { + if (!(rs->flags & RATELIMIT_MSG_ON_RELEASE)) { + pr_warn("%s: %d callbacks suppressed\n", func, rs->missed); + rs->missed = 0; + } + } rs->begin = jiffies; rs->printed = 0; - rs->missed = 0; } if (rs->burst && rs->burst > rs->printed) { rs->printed++; |