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hpdata: Return the number of pages to be purged.

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We'll use this in the next commit.
This commit is contained in:
David Goldblatt 2020-12-06 13:16:51 -08:00 committed by David Goldblatt
parent 9fd9c876bb
commit dc886e5608
3 changed files with 13 additions and 5 deletions
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5
include/jemalloc/internal/hpdata.h
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@ -363,8 +363,11 @@ struct hpdata_purge_state_s {
* Once you begin purging, you have to follow through and call hpdata_purge_next
* until you're done, and then end. Allocating out of an hpdata undergoing
* purging is not allowed.
*
* Returns the number of pages that will be purged.
*/
void hpdata_purge_begin(hpdata_t *hpdata, hpdata_purge_state_t *purge_state);
size_t hpdata_purge_begin(hpdata_t *hpdata, hpdata_purge_state_t *purge_state);
/*
* If there are more extents to purge, sets *r_purge_addr and *r_purge_size to
* true, and returns true. Otherwise, returns false to indicate that we're

7
src/hpdata.c
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@ -158,7 +158,7 @@ hpdata_unreserve(hpdata_t *hpdata, void *addr, size_t sz) {
hpdata_assert_consistent(hpdata);
}
void
size_t
hpdata_purge_begin(hpdata_t *hpdata, hpdata_purge_state_t *purge_state) {
hpdata_assert_consistent(hpdata);
/* See the comment in reserve. */
@ -181,10 +181,13 @@ hpdata_purge_begin(hpdata_t *hpdata, hpdata_purge_state_t *purge_state) {
hpdata->touched_pages, HUGEPAGE_PAGES);
/* We purge everything we can. */
assert(hpdata->h_ntouched - hpdata->h_nactive == fb_scount(
size_t to_purge = hpdata->h_ntouched - hpdata->h_nactive;
assert(to_purge == fb_scount(
purge_state->to_purge, HUGEPAGE_PAGES, 0, HUGEPAGE_PAGES));
hpdata_assert_consistent(hpdata);
return to_purge;
}
bool

6
test/unit/hpdata.c
View File

@ -68,7 +68,8 @@ TEST_BEGIN(test_purge_simple) {
expect_zu_eq(hpdata_ntouched_get(&hpdata), HUGEPAGE_PAGES / 2, "");
hpdata_purge_state_t purge_state;
hpdata_purge_begin(&hpdata, &purge_state);
size_t to_purge = hpdata_purge_begin(&hpdata, &purge_state);
expect_zu_eq(HUGEPAGE_PAGES / 4, to_purge, "");
void *purge_addr;
size_t purge_size;
@ -112,7 +113,8 @@ TEST_BEGIN(test_purge_intervening_dalloc) {
expect_zu_eq(hpdata_ntouched_get(&hpdata), 3 * HUGEPAGE_PAGES / 4, "");
hpdata_purge_state_t purge_state;
hpdata_purge_begin(&hpdata, &purge_state);
size_t to_purge = hpdata_purge_begin(&hpdata, &purge_state);
expect_zu_eq(HUGEPAGE_PAGES / 2, to_purge, "");
void *purge_addr;
size_t purge_size;