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authorRavikiran G Thirumalai <kiran@scalex86.org>2006-04-10 22:52:54 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-04-11 06:18:31 -0700
commitfb7faf3313d527bf68ba2e7ff3a2b6ebf201af73 (patch)
treeca4884d9fb0312eb19480b8319f2e01633298eda /mm
parent5b74ada7eea1b0064d2b72384827853f349d803a (diff)
downloadlinux-stericsson-fb7faf3313d527bf68ba2e7ff3a2b6ebf201af73.tar.gz
[PATCH] slab: add statistics for alien cache overflows
Add a statistics counter which is incremented everytime the alien cache overflows. alien_cache limit is hardcoded to 12 right now. We can use this statistics to tune alien cache if needed in the future. Signed-off-by: Alok N Kataria <alokk@calsoftinc.com> Signed-off-by: Ravikiran Thirumalai <kiran@scalex86.org> Signed-off-by: Shai Fultheim <shai@scalex86.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/slab.c14
1 files changed, 10 insertions, 4 deletions
diff --git a/mm/slab.c b/mm/slab.c
index afabad54c4c6..752c5570f2f6 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -420,6 +420,7 @@ struct kmem_cache {
unsigned long max_freeable;
unsigned long node_allocs;
unsigned long node_frees;
+ unsigned long node_overflow;
atomic_t allochit;
atomic_t allocmiss;
atomic_t freehit;
@@ -465,6 +466,7 @@ struct kmem_cache {
#define STATS_INC_ERR(x) ((x)->errors++)
#define STATS_INC_NODEALLOCS(x) ((x)->node_allocs++)
#define STATS_INC_NODEFREES(x) ((x)->node_frees++)
+#define STATS_INC_ACOVERFLOW(x) ((x)->node_overflow++)
#define STATS_SET_FREEABLE(x, i) \
do { \
if ((x)->max_freeable < i) \
@@ -484,6 +486,7 @@ struct kmem_cache {
#define STATS_INC_ERR(x) do { } while (0)
#define STATS_INC_NODEALLOCS(x) do { } while (0)
#define STATS_INC_NODEFREES(x) do { } while (0)
+#define STATS_INC_ACOVERFLOW(x) do { } while (0)
#define STATS_SET_FREEABLE(x, i) do { } while (0)
#define STATS_INC_ALLOCHIT(x) do { } while (0)
#define STATS_INC_ALLOCMISS(x) do { } while (0)
@@ -3083,9 +3086,11 @@ static inline void __cache_free(struct kmem_cache *cachep, void *objp)
if (l3->alien && l3->alien[nodeid]) {
alien = l3->alien[nodeid];
spin_lock(&alien->lock);
- if (unlikely(alien->avail == alien->limit))
+ if (unlikely(alien->avail == alien->limit)) {
+ STATS_INC_ACOVERFLOW(cachep);
__drain_alien_cache(cachep,
alien, nodeid);
+ }
alien->entry[alien->avail++] = objp;
spin_unlock(&alien->lock);
} else {
@@ -3763,7 +3768,7 @@ static void print_slabinfo_header(struct seq_file *m)
seq_puts(m, " : slabdata <active_slabs> <num_slabs> <sharedavail>");
#if STATS
seq_puts(m, " : globalstat <listallocs> <maxobjs> <grown> <reaped> "
- "<error> <maxfreeable> <nodeallocs> <remotefrees>");
+ "<error> <maxfreeable> <nodeallocs> <remotefrees> <alienoverflow>");
seq_puts(m, " : cpustat <allochit> <allocmiss> <freehit> <freemiss>");
#endif
seq_putc(m, '\n');
@@ -3877,11 +3882,12 @@ static int s_show(struct seq_file *m, void *p)
unsigned long max_freeable = cachep->max_freeable;
unsigned long node_allocs = cachep->node_allocs;
unsigned long node_frees = cachep->node_frees;
+ unsigned long overflows = cachep->node_overflow;
seq_printf(m, " : globalstat %7lu %6lu %5lu %4lu \
- %4lu %4lu %4lu %4lu", allocs, high, grown,
+ %4lu %4lu %4lu %4lu %4lu", allocs, high, grown,
reaped, errors, max_freeable, node_allocs,
- node_frees);
+ node_frees, overflows);
}
/* cpu stats */
{