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Allow opt.tcache_max to accept small size classes.

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Previously all the small size classes were cached.  However this has downsides
-- particularly when page size is greater than 4K (e.g. iOS), which will result
in much higher SMALL_MAXCLASS.

This change allows tcache_max to be set to lower values, to better control
resources taken by tcache.
This commit is contained in:
Qi Wang 2020-10-21 19:47:57 -07:00 • committed by Qi Wang
parent ea32060f9c
commit bf72188f80
10 changed files with 265 additions and 33 deletions
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11
include/jemalloc/internal/cache_bin.h
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@ -20,6 +20,17 @@
*/
typedef uint16_t cache_bin_sz_t;
/*
* Leave a noticeable mark pattern on the cache bin stack boundaries, in case a
* bug starts leaking those. Make it look like the junk pattern but be distinct
* from it.
*/
static const uintptr_t cache_bin_preceding_junk =
(uintptr_t)0x7a7a7a7a7a7a7a7aULL;
/* Note: a7 vs. 7a above -- this tells you which pointer leaked. */
static const uintptr_t cache_bin_trailing_junk =
(uintptr_t)0xa7a7a7a7a7a7a7a7ULL;
/*
* That implies the following value, for the maximum number of items in any
* individual bin. The cache bins track their bounds looking just at the low