99fc0717e6
Really, this isn't a functional change, just a naming change. We start thinking of pageslabs as being always in the psset. What we used to think of as removal is now thought of as being in the psset, but in the process of being updated (and therefore, unavalable for serving new allocations). This is in preparation of subsequent changes to support deferred purging; allocations will still be in the psset for the purposes of choosing when to purge, but not for purposes of allocation/deallocation.
78 lines
2.4 KiB
C
78 lines
2.4 KiB
C
#ifndef JEMALLOC_INTERNAL_PSSET_H
|
|
#define JEMALLOC_INTERNAL_PSSET_H
|
|
|
|
#include "jemalloc/internal/hpdata.h"
|
|
|
|
/*
|
|
* A page-slab set. What the eset is to PAC, the psset is to HPA. It maintains
|
|
* a collection of page-slabs (the intent being that they are backed by
|
|
* hugepages, or at least could be), and handles allocation and deallocation
|
|
* requests.
|
|
*
|
|
* It has the same synchronization guarantees as the eset; stats queries don't
|
|
* need any external synchronization, everything else does.
|
|
*/
|
|
|
|
/*
|
|
* One more than the maximum pszind_t we will serve out of the HPA.
|
|
* Practically, we expect only the first few to be actually used. This
|
|
* corresponds to a maximum size of of 512MB on systems with 4k pages and
|
|
* SC_NGROUP == 4, which is already an unreasonably large maximum. Morally, you
|
|
* can think of this as being SC_NPSIZES, but there's no sense in wasting that
|
|
* much space in the arena, making bitmaps that much larger, etc.
|
|
*/
|
|
#define PSSET_NPSIZES 64
|
|
|
|
typedef struct psset_bin_stats_s psset_bin_stats_t;
|
|
struct psset_bin_stats_s {
|
|
/* How many pageslabs are in this bin? */
|
|
size_t npageslabs;
|
|
/* Of them, how many pages are active? */
|
|
size_t nactive;
|
|
/* And how many are dirty? */
|
|
size_t ndirty;
|
|
};
|
|
|
|
typedef struct psset_stats_s psset_stats_t;
|
|
struct psset_stats_s {
|
|
|
|
/*
|
|
* The second index is huge stats; nonfull_slabs[pszind][0] contains
|
|
* stats for the non-huge slabs in bucket pszind, while
|
|
* nonfull_slabs[pszind][1] contains stats for the huge slabs.
|
|
*/
|
|
psset_bin_stats_t nonfull_slabs[PSSET_NPSIZES][2];
|
|
|
|
/*
|
|
* Full slabs don't live in any edata heap. But we still track their
|
|
* stats.
|
|
*/
|
|
psset_bin_stats_t full_slabs[2];
|
|
};
|
|
|
|
typedef struct psset_s psset_t;
|
|
struct psset_s {
|
|
/*
|
|
* The pageslabs, quantized by the size class of the largest contiguous
|
|
* free run of pages in a pageslab.
|
|
*/
|
|
hpdata_age_heap_t pageslabs[PSSET_NPSIZES];
|
|
bitmap_t bitmap[BITMAP_GROUPS(PSSET_NPSIZES)];
|
|
psset_stats_t stats;
|
|
};
|
|
|
|
void psset_init(psset_t *psset);
|
|
void psset_stats_accum(psset_stats_t *dst, psset_stats_t *src);
|
|
|
|
/*
|
|
* Begin or end updating the given pageslab's metadata. While the pageslab is
|
|
* being updated, it won't be returned from psset_fit calls.
|
|
*/
|
|
void psset_update_begin(psset_t *psset, hpdata_t *ps);
|
|
void psset_update_end(psset_t *psset, hpdata_t *ps);
|
|
|
|
/* Analogous to the eset_fit; pick a hpdata to serve the request. */
|
|
hpdata_t *psset_pick_alloc(psset_t *psset, size_t size);
|
|
|
|
#endif /* JEMALLOC_INTERNAL_PSSET_H */
|