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Add opt hpa_hugify_sync to hugify synchronously

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Linux 6.1 introduced `MADV_COLLAPSE` flag to perform a best-effort
synchronous collapse of the native pages mapped by the memory range into
transparent huge pages.

Synchronous hugification might be beneficial for at least two reasons:
we are not relying on khugepaged anymore and get an instant feedback if
range wasn't hugified.

If `hpa_hugify_sync` option is on, we'll try to perform synchronously
collapse and if it wasn't successful, we'll fallback to asynchronous
behaviour.
This commit is contained in:
Dmitry Ilvokhin
2024-10-31 11:43:11 -07:00
committed by stanjo74
parent a361e886e2
commit 0ce13c6fb5
15 changed files with 141 additions and 8 deletions
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test/unit/mallctl.c
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@@ -288,6 +288,7 @@ TEST_BEGIN(test_mallctl_opt) {
TEST_MALLCTL_OPT(const char *, dss, always);
TEST_MALLCTL_OPT(bool, hpa, always);
TEST_MALLCTL_OPT(size_t, hpa_slab_max_alloc, always);
TEST_MALLCTL_OPT(bool, hpa_hugify_sync, always);
TEST_MALLCTL_OPT(size_t, hpa_sec_nshards, always);
TEST_MALLCTL_OPT(size_t, hpa_sec_max_alloc, always);
TEST_MALLCTL_OPT(size_t, hpa_sec_max_bytes, always);