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HPA: Generalize purging.

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Previously, we would purge a hugepage only when it's completely empty.  With
this change, we can purge even when only partially empty.  Although the
heuristic here is still fairly primitive, this infrastructure can scale to
become more advanced.
This commit is contained in:
David Goldblatt
2020-12-02 22:24:15 -08:00
committed by David Goldblatt
parent 70692cfb13
commit 30b9e8162b
5 changed files with 208 additions and 64 deletions
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35
src/hpdata.c
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@@ -24,6 +24,7 @@ hpdata_init(hpdata_t *hpdata, void *addr, uint64_t age) {
hpdata->h_huge = false;
hpdata->h_mid_purge = false;
hpdata->h_mid_hugify = false;
hpdata->h_in_psset = false;
hpdata_longest_free_range_set(hpdata, HUGEPAGE_PAGES);
hpdata->h_nactive = 0;
fb_init(hpdata->active_pages, HUGEPAGE_PAGES);
@@ -36,6 +37,7 @@ hpdata_init(hpdata_t *hpdata, void *addr, uint64_t age) {
void *
hpdata_reserve_alloc(hpdata_t *hpdata, size_t sz) {
hpdata_assert_consistent(hpdata);
assert(!hpdata_in_psset_get(hpdata));
assert((sz & PAGE_MASK) == 0);
size_t npages = sz >> LG_PAGE;
assert(npages <= hpdata_longest_free_range_get(hpdata));
@@ -116,6 +118,7 @@ hpdata_reserve_alloc(hpdata_t *hpdata, size_t sz) {
void
hpdata_unreserve(hpdata_t *hpdata, void *addr, size_t sz) {
hpdata_assert_consistent(hpdata);
assert(!hpdata->h_in_psset);
assert(((uintptr_t)addr & PAGE_MASK) == 0);
assert((sz & PAGE_MASK) == 0);
size_t begin = ((uintptr_t)addr - (uintptr_t)hpdata_addr_get(hpdata))
@@ -144,6 +147,7 @@ hpdata_unreserve(hpdata_t *hpdata, void *addr, size_t sz) {
void
hpdata_purge_begin(hpdata_t *hpdata, hpdata_purge_state_t *purge_state) {
hpdata_assert_consistent(hpdata);
assert(!hpdata->h_in_psset);
assert(!hpdata->h_mid_purge);
assert(!hpdata->h_mid_hugify);
hpdata->h_mid_purge = true;
@@ -181,6 +185,7 @@ hpdata_purge_next(hpdata_t *hpdata, hpdata_purge_state_t *purge_state,
* a consistent state.
*/
assert(hpdata->h_mid_purge);
assert(!hpdata->h_in_psset);
/* Should have dehugified already (if necessary). */
assert(!hpdata->h_huge);
assert(!hpdata->h_mid_hugify);
@@ -210,6 +215,7 @@ hpdata_purge_next(hpdata_t *hpdata, hpdata_purge_state_t *purge_state,
void
hpdata_purge_end(hpdata_t *hpdata, hpdata_purge_state_t *purge_state) {
hpdata_assert_consistent(hpdata);
assert(!hpdata->h_in_psset);
assert(hpdata->h_mid_purge);
assert(!hpdata->h_mid_hugify);
hpdata->h_mid_purge = false;
@@ -230,6 +236,7 @@ hpdata_purge_end(hpdata_t *hpdata, hpdata_purge_state_t *purge_state) {
void
hpdata_hugify_begin(hpdata_t *hpdata) {
hpdata_assert_consistent(hpdata);
assert(!hpdata_in_psset_get(hpdata));
assert(!hpdata->h_mid_purge);
assert(!hpdata->h_mid_hugify);
hpdata->h_mid_hugify = true;
@@ -242,6 +249,11 @@ hpdata_hugify_begin(hpdata_t *hpdata) {
void
hpdata_hugify_end(hpdata_t *hpdata) {
hpdata_assert_consistent(hpdata);
/*
* This is the exception to the "no metadata tweaks while in the psset"
* rule.
*/
/* assert(!hpdata_in_psset_get(hpdata)); */
assert(!hpdata->h_mid_purge);
assert(hpdata->h_mid_hugify);
hpdata->h_mid_hugify = false;
@@ -251,30 +263,9 @@ hpdata_hugify_end(hpdata_t *hpdata) {
void
hpdata_dehugify(hpdata_t *hpdata) {
hpdata_assert_consistent(hpdata);
/*
* These asserts are morally right; for now, though, we have the "purge a
* hugepage only in its entirety, when it becomes empty", path sharing
* hpdata_dehugify with the new purge pathway coming in the next
* commit.
*/
/*
assert(!hpdata_in_psset_get(hpdata));
assert(hpdata->h_mid_purge);
assert(!hpdata->h_mid_hugify);
*/
hpdata->h_huge = false;
hpdata_assert_consistent(hpdata);
}
void
hpdata_purge(hpdata_t *hpdata) {
hpdata_assert_consistent(hpdata);
/*
* The hpdata must be empty; we don't (yet) support partial purges of
* hugepages.
*/
assert(hpdata->h_nactive == 0);
fb_unset_range(hpdata->dirty_pages, HUGEPAGE_PAGES, 0, HUGEPAGE_PAGES);
fb_init(hpdata->dirty_pages, HUGEPAGE_PAGES);
hpdata->h_ndirty = 0;
hpdata_assert_consistent(hpdata);
}