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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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2
src/zmalloc.h
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@ -86,6 +86,8 @@ size_t zmalloc_used_memory(void);
void zmalloc_set_oom_handler(void (*oom_handler)(size_t));
size_t zmalloc_get_rss(void);
int zmalloc_get_allocator_info(size_t *allocated, size_t *active, size_t *resident);
void set_jemalloc_bg_thread(int enable);
int jemalloc_purge();
size_t zmalloc_get_private_dirty(long pid);
size_t zmalloc_get_smap_bytes_by_field(char *field, long pid);
size_t zmalloc_get_memory_size(void);