Fix for a bug where only one process (of multiple) blocked on
maxpages on a zone is woken up, with the rest never being woken up as a result of the ZFLAG_FULL flag being cleared. Wakeup all such blocked procsses instead. This change introduces a thundering herd, but since this should be relatively infrequent, optimizing this (by introducing a count of blocked processes, for example) may be premature. Reviewd by: ups@
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=166211
@ -2475,8 +2475,13 @@ uma_zfree_internal(uma_zone_t zone, void *item, void *udata,
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if (keg->uk_pages < keg->uk_maxpages)
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keg->uk_flags &= ~UMA_ZFLAG_FULL;
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/* We can handle one more allocation */
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wakeup_one(keg);
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/*
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* We can handle one more allocation. Since we're clearing ZFLAG_FULL,
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* wake up all procs blocked on pages. This should be uncommon, so
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* keeping this simple for now (rather than adding count of blocked
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* threads etc).
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*/
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wakeup(keg);
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}
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ZONE_UNLOCK(zone);
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