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[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>
This commit is contained in:
Ravikiran G Thirumalai 2006-04-10 22:52:54 -07:00 committed by Linus Torvalds
parent 5b74ada7ee
commit fb7faf3313
1 changed files with 10 additions and 4 deletions
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14
mm/slab.c
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@ -420,6 +420,7 @@ struct kmem_cache {
unsigned long max_freeable; unsigned long max_freeable;
unsigned long node_allocs; unsigned long node_allocs;
unsigned long node_frees; unsigned long node_frees;
unsigned long node_overflow;
atomic_t allochit; atomic_t allochit;
atomic_t allocmiss; atomic_t allocmiss;
atomic_t freehit; atomic_t freehit;
@ -465,6 +466,7 @@ struct kmem_cache {
#define STATS_INC_ERR(x) ((x)->errors++) #define STATS_INC_ERR(x) ((x)->errors++)
#define STATS_INC_NODEALLOCS(x) ((x)->node_allocs++) #define STATS_INC_NODEALLOCS(x) ((x)->node_allocs++)
#define STATS_INC_NODEFREES(x) ((x)->node_frees++) #define STATS_INC_NODEFREES(x) ((x)->node_frees++)
#define STATS_INC_ACOVERFLOW(x) ((x)->node_overflow++)
#define STATS_SET_FREEABLE(x, i) \ #define STATS_SET_FREEABLE(x, i) \
do { \ do { \
if ((x)->max_freeable < i) \ if ((x)->max_freeable < i) \
@ -484,6 +486,7 @@ struct kmem_cache {
#define STATS_INC_ERR(x) do { } while (0) #define STATS_INC_ERR(x) do { } while (0)
#define STATS_INC_NODEALLOCS(x) do { } while (0) #define STATS_INC_NODEALLOCS(x) do { } while (0)
#define STATS_INC_NODEFREES(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_SET_FREEABLE(x, i) do { } while (0)
#define STATS_INC_ALLOCHIT(x) do { } while (0) #define STATS_INC_ALLOCHIT(x) do { } while (0)
#define STATS_INC_ALLOCMISS(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]) { if (l3->alien && l3->alien[nodeid]) {
alien = l3->alien[nodeid]; alien = l3->alien[nodeid];
spin_lock(&alien->lock); spin_lock(&alien->lock);
if (unlikely(alien->avail == alien->limit)) if (unlikely(alien->avail == alien->limit)) {
STATS_INC_ACOVERFLOW(cachep);
__drain_alien_cache(cachep, __drain_alien_cache(cachep,
alien, nodeid); alien, nodeid);
}
alien->entry[alien->avail++] = objp; alien->entry[alien->avail++] = objp;
spin_unlock(&alien->lock); spin_unlock(&alien->lock);
} else { } else {
@ -3763,7 +3768,7 @@ static void print_slabinfo_header(struct seq_file *m)
seq_puts(m, " : slabdata <active_slabs> <num_slabs> <sharedavail>"); seq_puts(m, " : slabdata <active_slabs> <num_slabs> <sharedavail>");
#if STATS #if STATS
seq_puts(m, " : globalstat <listallocs> <maxobjs> <grown> <reaped> " 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>"); seq_puts(m, " : cpustat <allochit> <allocmiss> <freehit> <freemiss>");
#endif #endif
seq_putc(m, '\n'); 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 max_freeable = cachep->max_freeable;
unsigned long node_allocs = cachep->node_allocs; unsigned long node_allocs = cachep->node_allocs;
unsigned long node_frees = cachep->node_frees; unsigned long node_frees = cachep->node_frees;
unsigned long overflows = cachep->node_overflow;
seq_printf(m, " : globalstat %7lu %6lu %5lu %4lu \ 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, reaped, errors, max_freeable, node_allocs,
node_frees); node_frees, overflows);
} }
/* cpu stats */ /* cpu stats */
{ {