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SEC: Allow arbitrarily many shards, cached sizes.

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This commit is contained in:
David Goldblatt
2021-05-18 14:52:46 -07:00
committed by David Goldblatt
parent 11beab38bc
commit 36c6bfb963
7 changed files with 59 additions and 41 deletions
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4
include/jemalloc/internal/pa.h
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@@ -130,8 +130,8 @@ bool pa_shard_init(tsdn_t *tsdn, pa_shard_t *shard, emap_t *emap, base_t *base,
* This isn't exposed to users; we allow late enablement of the HPA shard so
* that we can boot without worrying about the HPA, then turn it on in a0.
*/
bool pa_shard_enable_hpa(pa_shard_t *shard, const hpa_shard_opts_t *hpa_opts,
const sec_opts_t *hpa_sec_opts);
bool pa_shard_enable_hpa(tsdn_t *tsdn, pa_shard_t *shard,
const hpa_shard_opts_t *hpa_opts, const sec_opts_t *hpa_sec_opts);
/*
* We stop using the HPA when custom extent hooks are installed, but still
* redirect deallocations to it.

22
include/jemalloc/internal/sec.h
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@@ -13,20 +13,6 @@
* knowledge of the underlying PAI implementation).
*/
/*
* This is a *small* extent cache, after all. Assuming 4k pages and an ngroup
* of 4, this allows caching of sizes up to 128k.
*/
#define SEC_NPSIZES 16
/*
* For now, we put a cap on the number of SECs an arena can have. There's no
* reason it can't be dynamic; it's just inconvenient. This number of shards
* are embedded in the arenas, so there's a space / configurability tradeoff
* here. Eventually, we should probably dynamically allocate only however many
* we require.
*/
#define SEC_NSHARDS_MAX 8
/*
* For now, this is just one field; eventually, we'll probably want to get more
* fine-grained data out (like per-size class statistics).
@@ -91,7 +77,7 @@ struct sec_shard_s {
* hooks are installed.
*/
bool enabled;
sec_bin_t bins[SEC_NPSIZES];
sec_bin_t *bins;
/* Number of bytes in all bins in the shard. */
size_t bytes_cur;
/* The next pszind to flush in the flush-some pathways. */
@@ -104,10 +90,12 @@ struct sec_s {
pai_t *fallback;
sec_opts_t opts;
sec_shard_t shards[SEC_NSHARDS_MAX];
sec_shard_t *shards;
pszind_t npsizes;
};
bool sec_init(sec_t *sec, pai_t *fallback, const sec_opts_t *opts);
bool sec_init(tsdn_t *tsdn, sec_t *sec, base_t *base, pai_t *fallback,
const sec_opts_t *opts);
void sec_flush(tsdn_t *tsdn, sec_t *sec);
void sec_disable(tsdn_t *tsdn, sec_t *sec);