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authorIngo Molnar <mingo@elte.hu>2009-09-22 14:44:11 +0200
committerIngo Molnar <mingo@elte.hu>2009-09-22 15:31:34 +0200
commit979f693def9084a452846365dfde5dcb28366333 (patch)
tree4e01718c89c770c82cb3075958a7c0d33631ccf2 /lib/ratelimit.c
parentb8c7f1dc5ca4e0d10709182233cdab932cef593d (diff)
downloadlinux-2.6.34-ux500-979f693def9084a452846365dfde5dcb28366333.tar.gz
ratelimit: Use per ratelimit context locking
I'd like to use printk_ratelimit() in atomic context, but that's not possible right now due to the spinlock usage this commit introduced more than a year ago: 717115e: printk ratelimiting rewrite As a first step push the lock into the ratelimit state structure. This allows us to deal with locking failures to be considered as an event related to that state being too busy. Also clean up the code a bit (without changing functionality): - tidy up the definitions - clean up the code flow This also shrinks the code a tiny bit: text data bss dec hex filename 264 0 4 268 10c ratelimit.o.before 255 0 0 255 ff ratelimit.o.after ( Whole-kernel data size got a bit larger, because we have two ratelimit-state data structures right now. ) Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: David S. Miller <davem@davemloft.net> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'lib/ratelimit.c')
-rw-r--r--lib/ratelimit.c29
1 files changed, 13 insertions, 16 deletions
diff --git a/lib/ratelimit.c b/lib/ratelimit.c
index 26187edcc7e..0e2c28e8a0c 100644
--- a/lib/ratelimit.c
+++ b/lib/ratelimit.c
@@ -7,15 +7,12 @@
* parameter. Now every user can use their own standalone ratelimit_state.
*
* This file is released under the GPLv2.
- *
*/
#include <linux/kernel.h>
#include <linux/jiffies.h>
#include <linux/module.h>
-static DEFINE_SPINLOCK(ratelimit_lock);
-
/*
* __ratelimit - rate limiting
* @rs: ratelimit_state data
@@ -26,11 +23,12 @@ static DEFINE_SPINLOCK(ratelimit_lock);
int __ratelimit(struct ratelimit_state *rs)
{
unsigned long flags;
+ int ret;
if (!rs->interval)
return 1;
- spin_lock_irqsave(&ratelimit_lock, flags);
+ spin_lock_irqsave(&rs->lock, flags);
if (!rs->begin)
rs->begin = jiffies;
@@ -38,20 +36,19 @@ int __ratelimit(struct ratelimit_state *rs)
if (rs->missed)
printk(KERN_WARNING "%s: %d callbacks suppressed\n",
__func__, rs->missed);
- rs->begin = 0;
+ rs->begin = 0;
rs->printed = 0;
- rs->missed = 0;
+ rs->missed = 0;
}
- if (rs->burst && rs->burst > rs->printed)
- goto print;
-
- rs->missed++;
- spin_unlock_irqrestore(&ratelimit_lock, flags);
- return 0;
+ if (rs->burst && rs->burst > rs->printed) {
+ rs->printed++;
+ ret = 1;
+ } else {
+ rs->missed++;
+ ret = 0;
+ }
+ spin_unlock_irqrestore(&rs->lock, flags);
-print:
- rs->printed++;
- spin_unlock_irqrestore(&ratelimit_lock, flags);
- return 1;
+ return ret;
}
EXPORT_SYMBOL(__ratelimit);