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e16ebfe27e
Currently there are deferral-relevant constants in arena.c and background_thread.c. This commit moves them out into corresponding PAC and HPA headers. Those commonly needed by both are put into a new header deferral.h where the contract of deferral are clearly stated.
31 lines
1.3 KiB
C
31 lines
1.3 KiB
C
#ifndef JEMALLOC_INTERNAL_DEFERRAL_H
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#define JEMALLOC_INTERNAL_DEFERRAL_H
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#include "jemalloc/internal/jemalloc_preamble.h"
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/*
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* The deferred-work contract shared by the page allocators that PRODUCE
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* deferred work (PAC decay-purge, HPA purge/hugify) and the drivers that
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* CONSUME it (the background thread, or the application-inline fallback).
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*
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* There is deliberately no polymorphic interface here: with only two
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* page allocators, a vtable's indirect calls are needless and inefficient.
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* Dispatch is direct pac_*()/hpa_*(), so the contract is a convention
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* documented here, not an enforced type. The only shared code it needs is the
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* constants below; each allocator keeps its own policy definition (functions
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* and constants) in its own header.
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*
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* The convention every page allocator follows:
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* - <alloc>_time_until_deferred_work(): nanoseconds until its next
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* deferred work is due. DEFERRED_WORK_MIN = "due now",
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* DEFERRED_WORK_MAX = "nothing pending"; anything between is a real
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* ns deadline.
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* - <alloc>_do_deferred_work(): perform whatever work is due now.
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* The pa layer reports the soonest deadline across its allocators; the
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* background thread sleeps until then, or indefinitely on DEFERRED_WORK_MAX.
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*/
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#define DEFERRED_WORK_MIN UINT64_C(0)
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#define DEFERRED_WORK_MAX UINT64_MAX
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#endif /* JEMALLOC_INTERNAL_DEFERRAL_H */
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