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Add PAC: Page allocator classic.

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For now, this is just a stub containing the ecaches, with no surrounding code
changed.  Eventually all the core allocator bits will be moved in, in the
subsequent stack of commits.
This commit is contained in:
David Goldblatt
2020-05-29 16:57:31 -07:00
committed by David Goldblatt
parent 1b5f632e0f
commit 777b0ba965
9 changed files with 106 additions and 84 deletions
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27
include/jemalloc/internal/pa.h
View File

@@ -7,8 +7,17 @@
#include "jemalloc/internal/edata_cache.h"
#include "jemalloc/internal/emap.h"
#include "jemalloc/internal/lockedint.h"
#include "jemalloc/internal/pac.h"
#include "jemalloc/internal/pai.h"
/*
* The page allocator; responsible for acquiring pages of memory for
* allocations. It picks the implementation of the page allocator interface
* (i.e. a pai_t) to handle a given page-level allocation request. For now, the
* only such implementation is the PAC code ("page allocator classic"), but
* others will be coming soon.
*/
enum pa_decay_purge_setting_e {
PA_DECAY_PURGE_ALWAYS,
PA_DECAY_PURGE_NEVER,
@@ -16,11 +25,6 @@ enum pa_decay_purge_setting_e {
};
typedef enum pa_decay_purge_setting_e pa_decay_purge_setting_t;
/*
* The page allocator; responsible for acquiring pages of memory for
* allocations.
*/
typedef struct pa_shard_decay_stats_s pa_shard_decay_stats_t;
struct pa_shard_decay_stats_s {
/* Total number of purge sweeps. */
@@ -117,16 +121,7 @@ struct pa_shard_s {
* this is the *only* pai, but we'll soon grow another.
*/
pai_t ecache_pai;
/*
* Collections of extents that were previously allocated. These are
* used when allocating extents, in an attempt to re-use address space.
*
* Synchronization: internal.
*/
ecache_t ecache_dirty;
ecache_t ecache_muzzy;
ecache_t ecache_retained;
pac_t pac;
/* The source of edata_t objects. */
edata_cache_t edata_cache;
@@ -167,7 +162,7 @@ pa_shard_muzzy_decay_ms_get(pa_shard_t *shard) {
static inline bool
pa_shard_dont_decay_muzzy(pa_shard_t *shard) {
return ecache_npages_get(&shard->ecache_muzzy) == 0 &&
return ecache_npages_get(&shard->pac.ecache_muzzy) == 0 &&
pa_shard_muzzy_decay_ms_get(shard) <= 0;
}

25
include/jemalloc/internal/pac.h Normal file
View File

@@ -0,0 +1,25 @@
#ifndef JEMALLOC_INTERNAL_PAC_H
#define JEMALLOC_INTERNAL_PAC_H
/*
* Page allocator classic; an implementation of the PAI interface that:
* - Can be used for arenas with custom extent hooks.
* - Can always satisfy any allocation request (including highly-fragmentary
* ones).
* - Can use efficient OS-level zeroing primitives for demand-filled pages.
*/
typedef struct pac_s pac_t;
struct pac_s {
/*
* Collections of extents that were previously allocated. These are
* used when allocating extents, in an attempt to re-use address space.
*
* Synchronization: internal.
*/
ecache_t ecache_dirty;
ecache_t ecache_muzzy;
ecache_t ecache_retained;
};
#endif /* JEMALLOC_INTERNAL_PAC_H */