Date: Wed, 30 Jul 2003 01:23:21 GMT From: Tor.Egge@cvsup.no.freebsd.org To: phk@phk.freebsd.dk Cc: current@freebsd.org Subject: Re: HEADSUP: UMA not reentrant / possible memory leak Message-ID: <20030730012321I.tegge@cvsup.no.freebsd.org> In-Reply-To: <88569.1059513090@critter.freebsd.dk> References: <88569.1059513090@critter.freebsd.dk>
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[-- Attachment #1 --]
> The indication of this is that the g_bio zone does not return to
> zero USED as it should.
It looks like z->uz_cachefree is slightly out of date (updated in
zone_timout() every 20th second) and often too low (not taking the
z->uz_full_bucket list into account).
The enclosed patch recalculates the number of free elements on the
buckets instead of using z->uz_cachefree.
- Tor Egge
[-- Attachment #2 --]
Index: sys/vm/uma_core.c
===================================================================
RCS file: /home/ncvs/src/sys/vm/uma_core.c,v
retrieving revision 1.63
diff -u -r1.63 uma_core.c
--- sys/vm/uma_core.c 28 Jul 2003 02:29:07 -0000 1.63
+++ sys/vm/uma_core.c 30 Jul 2003 01:05:37 -0000
@@ -2092,6 +2092,10 @@
char *tmpbuf, *offset;
uma_zone_t z;
char *p;
+ int cpu;
+ int cachefree;
+ uma_bucket_t bucket;
+ uma_cache_t cache;
cnt = 0;
mtx_lock(&uma_mtx);
@@ -2112,8 +2116,27 @@
LIST_FOREACH(z, &uma_zones, uz_link) {
if (cnt == 0) /* list may have changed size */
break;
+ for (cpu = 0; cpu < maxcpu; cpu++) {
+ if (CPU_ABSENT(cpu))
+ continue;
+ CPU_LOCK(cpu);
+ }
ZONE_LOCK(z);
- totalfree = z->uz_free + z->uz_cachefree;
+ cachefree = 0;
+ for (cpu = 0; cpu < maxcpu; cpu++) {
+ if (CPU_ABSENT(cpu))
+ continue;
+ cache = &z->uz_cpu[cpu];
+ if (cache->uc_allocbucket != NULL)
+ cachefree += cache->uc_allocbucket->ub_ptr + 1;
+ if (cache->uc_freebucket != NULL)
+ cachefree += cache->uc_freebucket->ub_ptr + 1;
+ CPU_UNLOCK(cpu);
+ }
+ LIST_FOREACH(bucket, &z->uz_full_bucket, ub_link) {
+ cachefree += bucket->ub_ptr + 1;
+ }
+ totalfree = z->uz_free + cachefree;
len = snprintf(offset, linesize,
"%-12.12s %6.6u, %8.8u, %6.6u, %6.6u, %8.8llu\n",
z->uz_name, z->uz_size,
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