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Change opt.metadata_thp to [disabled,auto,always].

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To avoid the high RSS caused by THP + low usage arena (i.e. THP becomes a
significant percentage), added a new "auto" option which will only start using
THP after a base allocator used up the first THP region.  Starting from the
second hugepage (in a single arena), "auto" behaves the same as "always",
i.e. madvise hugepage right away.
This commit is contained in:
Qi Wang
2017-08-24 14:29:28 -07:00
committed by Qi Wang
parent ea91dfa58e
commit 47b20bb654
10 changed files with 84 additions and 25 deletions
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3
include/jemalloc/internal/base_externs.h
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@@ -1,7 +1,8 @@
#ifndef JEMALLOC_INTERNAL_BASE_EXTERNS_H
#define JEMALLOC_INTERNAL_BASE_EXTERNS_H
extern bool opt_metadata_thp;
extern metadata_thp_mode_t opt_metadata_thp;
extern const char *metadata_thp_mode_names[];
base_t *b0get(void);
base_t *base_new(tsdn_t *tsdn, unsigned ind, extent_hooks_t *extent_hooks);

4
include/jemalloc/internal/base_inlines.h
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@@ -6,4 +6,8 @@ base_ind_get(const base_t *base) {
return base->ind;
}
static inline bool
metadata_thp_enabled(void) {
return (opt_metadata_thp != metadata_thp_disabled);
}
#endif /* JEMALLOC_INTERNAL_BASE_INLINES_H */

17
include/jemalloc/internal/base_types.h
View File

@@ -4,6 +4,21 @@
typedef struct base_block_s base_block_t;
typedef struct base_s base_t;
#define METADATA_THP_DEFAULT false
#define METADATA_THP_DEFAULT metadata_thp_disabled
typedef enum {
metadata_thp_disabled = 0,
/*
* Lazily enable hugepage for metadata. To avoid high RSS caused by THP
* + low usage arena (i.e. THP becomes a significant percentage), the
* "auto" option only starts using THP after a base allocator used up
* the first THP region. Starting from the second hugepage (in a single
* arena), "auto" behaves the same as "always", i.e. madvise hugepage
* right away.
*/
metadata_thp_auto = 1,
metadata_thp_always = 2,
metadata_thp_mode_limit = 3
} metadata_thp_mode_t;
#endif /* JEMALLOC_INTERNAL_BASE_TYPES_H */