Author: sbruno
Date: Tue Jun 15 19:28:37 2010
New Revision: 209215
URL: http://svn.freebsd.org/changeset/base/209215
Log:
Add a new column to the output of vmstat -z to indicate the number
of times the system was forced to sleep when requesting a new allocation.
Expand the debugger hook, db_show_uma, to display these results as well.
This has proven to be very useful in out of memory situations when
it is not known why systems have become sluggish or fail in odd ways.
Reviewed by: rwatson alc
Approved by: scottl (mentor) peter
Obtained from: Yahoo Inc.
Modified:
head/lib/libmemstat/memstat.c
head/lib/libmemstat/memstat.h
head/lib/libmemstat/memstat_internal.h
head/lib/libmemstat/memstat_uma.c
head/sys/vm/uma.h
head/sys/vm/uma_core.c
head/sys/vm/uma_int.h
head/usr.bin/vmstat/vmstat.c
Modified: head/lib/libmemstat/memstat.c
==============================================================================
--- head/lib/libmemstat/memstat.c Tue Jun 15 19:19:04 2010
(r209214)
+++ head/lib/libmemstat/memstat.c Tue Jun 15 19:28:37 2010
(r209215)
@@ -188,6 +188,7 @@ _memstat_mt_reset_stats(struct memory_ty
mtp->mt_count = 0;
mtp->mt_free = 0;
mtp->mt_failures = 0;
+ mtp->mt_sleeps = 0;
mtp->mt_zonefree = 0;
mtp->mt_kegfree = 0;
@@ -304,6 +305,13 @@ memstat_get_failures(const struct memory
return (mtp->mt_failures);
}
+uint64_t
+memstat_get_sleeps(const struct memory_type *mtp)
+{
+
+ return (mtp->mt_sleeps);
+}
+
void *
memstat_get_caller_pointer(const struct memory_type *mtp, int index)
{
Modified: head/lib/libmemstat/memstat.h
==============================================================================
--- head/lib/libmemstat/memstat.h Tue Jun 15 19:19:04 2010
(r209214)
+++ head/lib/libmemstat/memstat.h Tue Jun 15 19:28:37 2010
(r209215)
@@ -139,6 +139,7 @@ uint64_t memstat_get_bytes(const struct
uint64_t memstat_get_count(const struct memory_type *mtp);
uint64_t memstat_get_free(const struct memory_type *mtp);
uint64_t memstat_get_failures(const struct memory_type *mtp);
+uint64_t memstat_get_sleeps(const struct memory_type *mtp);
void *memstat_get_caller_pointer(const struct memory_type *mtp,
int index);
void memstat_set_caller_pointer(struct memory_type *mtp,
Modified: head/lib/libmemstat/memstat_internal.h
==============================================================================
--- head/lib/libmemstat/memstat_internal.h Tue Jun 15 19:19:04 2010
(r209214)
+++ head/lib/libmemstat/memstat_internal.h Tue Jun 15 19:28:37 2010
(r209215)
@@ -65,6 +65,7 @@ struct memory_type {
uint64_t mt_count; /* Number of current allocations. */
uint64_t mt_free; /* Number of cached free items. */
uint64_t mt_failures; /* Number of allocation failures. */
+ uint64_t mt_sleeps; /* Number of allocation sleeps. */
/*
* Caller-owned memory.
Modified: head/lib/libmemstat/memstat_uma.c
==============================================================================
--- head/lib/libmemstat/memstat_uma.c Tue Jun 15 19:19:04 2010
(r209214)
+++ head/lib/libmemstat/memstat_uma.c Tue Jun 15 19:28:37 2010
(r209215)
@@ -208,6 +208,7 @@ retry:
mtp->mt_numallocs = uthp->uth_allocs;
mtp->mt_numfrees = uthp->uth_frees;
mtp->mt_failures = uthp->uth_fails;
+ mtp->mt_sleeps = uthp->uth_sleeps;
for (j = 0; j < maxcpus; j++) {
upsp = (struct uma_percpu_stat *)p;
@@ -402,6 +403,7 @@ memstat_kvm_uma(struct memory_type_list
mtp->mt_numallocs = uz.uz_allocs;
mtp->mt_numfrees = uz.uz_frees;
mtp->mt_failures = uz.uz_fails;
+ mtp->mt_sleeps = uz.uz_sleeps;
if (kz.uk_flags & UMA_ZFLAG_INTERNAL)
goto skip_percpu;
for (i = 0; i < mp_maxid + 1; i++) {
Modified: head/sys/vm/uma.h
==============================================================================
--- head/sys/vm/uma.h Tue Jun 15 19:19:04 2010 (r209214)
+++ head/sys/vm/uma.h Tue Jun 15 19:28:37 2010 (r209215)
@@ -600,7 +600,8 @@ struct uma_type_header {
u_int64_t uth_allocs; /* Zone: number of allocations. */
u_int64_t uth_frees; /* Zone: number of frees. */
u_int64_t uth_fails; /* Zone: number of alloc failures. */
- u_int64_t _uth_reserved1[3]; /* Reserved. */
+ u_int64_t uth_sleeps; /* Zone: number of alloc sleeps. */
+ u_int64_t _uth_reserved1[2]; /* Reserved. */
};
struct uma_percpu_stat {
Modified: head/sys/vm/uma_core.c
==============================================================================
--- head/sys/vm/uma_core.c Tue Jun 15 19:19:04 2010 (r209214)
+++ head/sys/vm/uma_core.c Tue Jun 15 19:28:37 2010 (r209215)
@@ -1396,6 +1396,7 @@ zone_ctor(void *mem, int size, void *uda
zone->uz_allocs = 0;
zone->uz_frees = 0;
zone->uz_fails = 0;
+ zone->uz_sleeps = 0;
zone->uz_fills = zone->uz_count = 0;
zone->uz_flags = 0;
keg = arg->keg;
@@ -2283,6 +2284,7 @@ zone_fetch_slab_multi(uma_zone_t zone, u
*/
if (full && !empty) {
zone->uz_flags |= UMA_ZFLAG_FULL;
+ zone->uz_sleeps++;
msleep(zone, zone->uz_lock, PVM, "zonelimit", hz/100);
zone->uz_flags &= ~UMA_ZFLAG_FULL;
continue;
@@ -3094,13 +3096,13 @@ uma_print_zone(uma_zone_t zone)
*/
static void
uma_zone_sumstat(uma_zone_t z, int *cachefreep, u_int64_t *allocsp,
- u_int64_t *freesp)
+ u_int64_t *freesp, u_int64_t *sleepsp)
{
uma_cache_t cache;
- u_int64_t allocs, frees;
+ u_int64_t allocs, frees, sleeps;
int cachefree, cpu;
- allocs = frees = 0;
+ allocs = frees = sleeps = 0;
cachefree = 0;
CPU_FOREACH(cpu) {
cache = &z->uz_cpu[cpu];
@@ -3113,12 +3115,15 @@ uma_zone_sumstat(uma_zone_t z, int *cach
}
allocs += z->uz_allocs;
frees += z->uz_frees;
+ sleeps += z->uz_sleeps;
if (cachefreep != NULL)
*cachefreep = cachefree;
if (allocsp != NULL)
*allocsp = allocs;
if (freesp != NULL)
*freesp = frees;
+ if (sleepsp != NULL)
+ *sleepsp = sleeps;
}
#endif /* DDB */
@@ -3226,6 +3231,7 @@ restart:
uth.uth_allocs = z->uz_allocs;
uth.uth_frees = z->uz_frees;
uth.uth_fails = z->uz_fails;
+ uth.uth_sleeps = z->uz_sleeps;
if (sbuf_bcat(&sbuf, &uth, sizeof(uth)) < 0) {
ZONE_UNLOCK(z);
mtx_unlock(&uma_mtx);
@@ -3277,32 +3283,33 @@ out:
#ifdef DDB
DB_SHOW_COMMAND(uma, db_show_uma)
{
- u_int64_t allocs, frees;
+ u_int64_t allocs, frees, sleeps;
uma_bucket_t bucket;
uma_keg_t kz;
uma_zone_t z;
int cachefree;
- db_printf("%18s %8s %8s %8s %12s\n", "Zone", "Size", "Used", "Free",
- "Requests");
+ db_printf("%18s %8s %8s %8s %12s %8s\n", "Zone", "Size", "Used", "Free",
+ "Requests", "Sleeps");
LIST_FOREACH(kz, &uma_kegs, uk_link) {
LIST_FOREACH(z, &kz->uk_zones, uz_link) {
if (kz->uk_flags & UMA_ZFLAG_INTERNAL) {
allocs = z->uz_allocs;
frees = z->uz_frees;
+ sleeps = z->uz_sleeps;
cachefree = 0;
} else
uma_zone_sumstat(z, &cachefree, &allocs,
- &frees);
+ &frees, &sleeps);
if (!((z->uz_flags & UMA_ZONE_SECONDARY) &&
(LIST_FIRST(&kz->uk_zones) != z)))
cachefree += kz->uk_free;
LIST_FOREACH(bucket, &z->uz_full_bucket, ub_link)
cachefree += bucket->ub_cnt;
- db_printf("%18s %8ju %8jd %8d %12ju\n", z->uz_name,
+ db_printf("%18s %8ju %8jd %8d %12ju %8ju\n", z->uz_name,
(uintmax_t)kz->uk_size,
(intmax_t)(allocs - frees), cachefree,
- (uintmax_t)allocs);
+ (uintmax_t)allocs, sleeps);
}
}
}
Modified: head/sys/vm/uma_int.h
==============================================================================
--- head/sys/vm/uma_int.h Tue Jun 15 19:19:04 2010 (r209214)
+++ head/sys/vm/uma_int.h Tue Jun 15 19:28:37 2010 (r209215)
@@ -327,6 +327,7 @@ struct uma_zone {
u_int64_t uz_allocs UMA_ALIGN; /* Total number of allocations */
u_int64_t uz_frees; /* Total number of frees */
u_int64_t uz_fails; /* Total number of alloc failures */
+ u_int64_t uz_sleeps; /* Total number of alloc sleeps */
uint16_t uz_fills; /* Outstanding bucket fills */
uint16_t uz_count; /* Highest value ub_ptr can have */
Modified: head/usr.bin/vmstat/vmstat.c
==============================================================================
--- head/usr.bin/vmstat/vmstat.c Tue Jun 15 19:19:04 2010
(r209214)
+++ head/usr.bin/vmstat/vmstat.c Tue Jun 15 19:28:37 2010
(r209215)
@@ -1294,16 +1294,17 @@ domemstat_zone(void)
memstat_strerror(error));
}
}
- printf("%-20s %8s %8s %8s %8s %8s %8s\n\n", "ITEM", "SIZE",
- "LIMIT", "USED", "FREE", "REQUESTS", "FAILURES");
+ printf("%-20s %6s %6s %8s %8s %8s %4s %4s\n\n", "ITEM", "SIZE",
+ "LIMIT", "USED", "FREE", "REQ", "FAIL", "SLEEP");
for (mtp = memstat_mtl_first(mtlp); mtp != NULL;
mtp = memstat_mtl_next(mtp)) {
strlcpy(name, memstat_get_name(mtp), MEMTYPE_MAXNAME);
strcat(name, ":");
- printf("%-20s %8llu, %8llu, %8llu, %8llu, %8llu, %8llu\n", name,
+ printf("%-20s %6llu,
%6llu,%8llu,%8llu,%8llu,%4llu,%4llu\n",name,
memstat_get_size(mtp), memstat_get_countlimit(mtp),
memstat_get_count(mtp), memstat_get_free(mtp),
- memstat_get_numallocs(mtp), memstat_get_failures(mtp));
+ memstat_get_numallocs(mtp), memstat_get_failures(mtp),
+ memstat_get_sleeps(mtp));
}
memstat_mtl_free(mtlp);
printf("\n");
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