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| author | Ravikiran G Thirumalai <kiran@scalex86.org> | 2006-04-10 22:52:54 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-04-11 06:18:31 -0700 |
| commit | fb7faf3313d527bf68ba2e7ff3a2b6ebf201af73 (patch) | |
| tree | ca4884d9fb0312eb19480b8319f2e01633298eda /mm | |
| parent | 5b74ada7eea1b0064d2b72384827853f349d803a (diff) | |
| download | lwn-fb7faf3313d527bf68ba2e7ff3a2b6ebf201af73.tar.gz lwn-fb7faf3313d527bf68ba2e7ff3a2b6ebf201af73.zip | |
[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.c | 14 |
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 */ { |