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make redis purge jemalloc after flush, and enable background purging thread

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jemalloc 5 doesn't immediately release memory back to the OS, instead there's a decaying
mechanism, which doesn't work when there's no traffic (no allocations).
this is most evident if there's no traffic after flushdb, the RSS will remain high.

1) enable jemalloc background purging
2) explicitly purge in flushdb
This commit is contained in:
Oran Agra
2019-05-30 12:51:32 +03:00
parent 2fec7d9c6c
commit 09f99c2a92
7 changed files with 124 additions and 0 deletions
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34
src/zmalloc.c
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@ -306,6 +306,7 @@ size_t zmalloc_get_rss(void) {
#endif
#if defined(USE_JEMALLOC)
int zmalloc_get_allocator_info(size_t *allocated,
size_t *active,
size_t *resident) {
@ -327,13 +328,46 @@ int zmalloc_get_allocator_info(size_t *allocated,
je_mallctl("stats.allocated", allocated, &sz, NULL, 0);
return 1;
}
void set_jemalloc_bg_thread(int enable) {
/* let jemalloc do purging asynchronously, required when there's no traffic
* after flushdb */
if (enable) {
char val = 1;
je_mallctl("background_thread", NULL, 0, &val, 1);
}
}
int jemalloc_purge() {
/* return all unused (reserved) pages to the OS */
char tmp[32];
unsigned narenas = 0;
size_t sz = sizeof(unsigned);
if (!je_mallctl("arenas.narenas", &narenas, &sz, NULL, 0)) {
sprintf(tmp, "arena.%d.purge", narenas);
if (!je_mallctl(tmp, NULL, 0, NULL, 0))
return 0;
}
return -1;
}
#else
int zmalloc_get_allocator_info(size_t *allocated,
size_t *active,
size_t *resident) {
*allocated = *resident = *active = 0;
return 1;
}
void set_jemalloc_bg_thread(int enable) {
((void)(enable));
}
int jemalloc_purge() {
return 0;
}
#endif
/* Get the sum of the specified field (converted form kb to bytes) in