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Limit maximum number of purged slabs with option

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Option `experimental_hpa_max_purge_nhp` introduced for backward
compatibility reasons: to make it possible to have behaviour similar
to buggy `hpa_strict_min_purge_interval` implementation.

When `experimental_hpa_max_purge_nhp` is set to -1, there is no limit
to number of slabs we'll purge on each iteration. Otherwise, we'll purge
no more than `experimental_hpa_max_purge_nhp` hugepages (slabs). This in
turn means we might not purge enough dirty pages to satisfy
`hpa_dirty_mult` requirement.

Combination of `hpa_dirty_mult`, `experimental_hpa_max_purge_nhp` and
`hpa_strict_min_purge_interval` options allows us to have steady rate of
pages returned back to the system. This provides a strickier latency
guarantees as number of `madvise` calls is bounded (and hence number of
TLB shootdowns is limited) in exchange to weaker memory usage
guarantees.
This commit is contained in:
Dmitry Ilvokhin 2024-08-06 08:47:57 -07:00 • committed by Qi Wang
parent 143f458188
commit aaa29003ab
7 changed files with 109 additions and 6 deletions
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8
src/ctl.c
View file

@ -104,6 +104,7 @@ CTL_PROTO(opt_hpa_hugification_threshold)
CTL_PROTO(opt_hpa_hugify_delay_ms)
CTL_PROTO(opt_hpa_min_purge_interval_ms)
CTL_PROTO(opt_hpa_strict_min_purge_interval)
CTL_PROTO(opt_experimental_hpa_max_purge_nhp)
CTL_PROTO(opt_hpa_dirty_mult)
CTL_PROTO(opt_hpa_sec_nshards)
CTL_PROTO(opt_hpa_sec_max_alloc)
@ -460,7 +461,10 @@ static const ctl_named_node_t opt_node[] = {
CTL(opt_hpa_hugification_threshold)},
{NAME("hpa_hugify_delay_ms"), CTL(opt_hpa_hugify_delay_ms)},
{NAME("hpa_min_purge_interval_ms"), CTL(opt_hpa_min_purge_interval_ms)},
{NAME("hpa_strict_min_purge_interval"), CTL(opt_hpa_strict_min_purge_interval)},
{NAME("hpa_strict_min_purge_interval"),
CTL(opt_hpa_strict_min_purge_interval)},
{NAME("experimental_hpa_max_purge_nhp"),
CTL(opt_experimental_hpa_max_purge_nhp)},
{NAME("hpa_dirty_mult"), CTL(opt_hpa_dirty_mult)},
{NAME("hpa_sec_nshards"), CTL(opt_hpa_sec_nshards)},
{NAME("hpa_sec_max_alloc"), CTL(opt_hpa_sec_max_alloc)},
@ -2197,6 +2201,8 @@ CTL_RO_NL_GEN(opt_hpa_min_purge_interval_ms, opt_hpa_opts.min_purge_interval_ms,
uint64_t)
CTL_RO_NL_GEN(opt_hpa_strict_min_purge_interval,
opt_hpa_opts.strict_min_purge_interval, bool)
CTL_RO_NL_GEN(opt_experimental_hpa_max_purge_nhp,
opt_hpa_opts.experimental_max_purge_nhp, ssize_t)
/*
* This will have to change before we publicly document this option; fxp_t and