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Fix a possible race in updating stats counters (#38826)

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and do some other isc mem cleanups.
This commit is contained in:
Mukund Sivaraman
2015-03-09 10:29:03 +05:30
parent f5a62d97e3
commit 24f2cc7d06
2 changed files with 19 additions and 26 deletions
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42
lib/isc/mem.c
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@@ -1262,13 +1262,10 @@ isc___mem_get(isc_mem_t *ctx0, size_t size FLARG) {
}
ADD_TRACE(ctx, ptr, size, file, line);
if (ctx->hi_water != 0U && ctx->inuse > ctx->hi_water &&
!ctx->is_overmem) {
if (ctx->hi_water != 0U && ctx->inuse > ctx->hi_water) {
ctx->is_overmem = ISC_TRUE;
}
if (ctx->hi_water != 0U && !ctx->hi_called &&
ctx->inuse > ctx->hi_water) {
call_water = ISC_TRUE;
if (!ctx->hi_called)
call_water = ISC_TRUE;
}
if (ctx->inuse > ctx->maxinuse) {
ctx->maxinuse = ctx->inuse;
@@ -1279,7 +1276,7 @@ isc___mem_get(isc_mem_t *ctx0, size_t size FLARG) {
}
MCTXUNLOCK(ctx, &ctx->lock);
if (call_water)
if (call_water && (ctx->water != NULL))
(ctx->water)(ctx->water_arg, ISC_MEM_HIWATER);
return (ptr);
@@ -1323,18 +1320,15 @@ isc___mem_put(isc_mem_t *ctx0, void *ptr, size_t size FLARG) {
* when the context was pushed over hi_water but then had
* isc_mem_setwater() called with 0 for hi_water and lo_water.
*/
if (ctx->is_overmem &&
(ctx->inuse < ctx->lo_water || ctx->lo_water == 0U)) {
if ((ctx->inuse < ctx->lo_water) || (ctx->lo_water == 0U)) {
ctx->is_overmem = ISC_FALSE;
}
if (ctx->hi_called &&
(ctx->inuse < ctx->lo_water || ctx->lo_water == 0U)) {
if (ctx->water != NULL)
if (ctx->hi_called)
call_water = ISC_TRUE;
}
MCTXUNLOCK(ctx, &ctx->lock);
if (call_water)
if (call_water && (ctx->water != NULL))
(ctx->water)(ctx->water_arg, ISC_MEM_LOWATER);
}
@@ -1387,8 +1381,8 @@ print_active(isc__mem_t *mctx, FILE *out) {
}
}
if (!found)
fprintf(out, "%s", isc_msgcat_get(isc_msgcat, ISC_MSGSET_MEM,
ISC_MSG_NONE, "\tNone.\n"));
fputs(isc_msgcat_get(isc_msgcat, ISC_MSGSET_MEM,
ISC_MSG_NONE, "\tNone.\n"), out);
}
}
#endif
@@ -1510,15 +1504,10 @@ isc___mem_allocate(isc_mem_t *ctx0, size_t size FLARG) {
REQUIRE(VALID_CONTEXT(ctx));
if ((ctx->flags & ISC_MEMFLAG_INTERNAL) != 0) {
MCTXLOCK(ctx, &ctx->lock);
si = mem_allocateunlocked((isc_mem_t *)ctx, size);
} else {
si = mem_allocateunlocked((isc_mem_t *)ctx, size);
MCTXLOCK(ctx, &ctx->lock);
if (si != NULL)
mem_getstats(ctx, si[-1].u.size);
}
MCTXLOCK(ctx, &ctx->lock);
si = mem_allocateunlocked((isc_mem_t *)ctx, size);
if (((ctx->flags & ISC_MEMFLAG_INTERNAL) == 0) && (si != NULL))
mem_getstats(ctx, si[-1].u.size);
#if ISC_MEM_TRACKLINES
ADD_TRACE(ctx, si, si[-1].u.size, file, line);
@@ -1773,7 +1762,6 @@ isc__mem_setwater(isc_mem_t *ctx0, isc_mem_water_t water, void *water_arg,
ctx->water_arg = NULL;
ctx->hi_water = 0;
ctx->lo_water = 0;
ctx->hi_called = ISC_FALSE;
} else {
if (ctx->hi_called &&
(ctx->water != water || ctx->water_arg != water_arg ||
@@ -2596,6 +2584,8 @@ json_renderctx(isc__mem_t *ctx, summarystat_t *summary, json_object *array) {
CHECKMEM(obj);
json_object_object_add(ctxobj, "pools", obj);
summary->contextsize += ctx->poolcnt * sizeof(isc_mempool_t);
obj = json_object_new_int64(ctx->hi_water);
CHECKMEM(obj);
json_object_object_add(ctxobj, "hiwater", obj);