41e0b857be
Header files are now self-contained, which makes the relationships between the files clearer, and crucially allows LSP tools like `clangd` to function correctly in all of our header files. I have verified that the headers are self-contained (aside from the various Windows shims) by compiling them as if they were C files – in a follow-up commit I plan to add this to CI to ensure we don't regress on this front.
62 lines
1.9 KiB
C
62 lines
1.9 KiB
C
#ifndef JEMALLOC_INTERNAL_SEC_OPTS_H
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#define JEMALLOC_INTERNAL_SEC_OPTS_H
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#include "jemalloc/internal/jemalloc_preamble.h"
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/*
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* The configuration settings used by an sec_t. Morally, this is part of the
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* SEC interface, but we put it here for header-ordering reasons.
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*/
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typedef struct sec_opts_s sec_opts_t;
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struct sec_opts_s {
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/*
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* We don't necessarily always use all the shards; requests are
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* distributed across shards [0, nshards - 1).
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*/
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size_t nshards;
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/*
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* We'll automatically refuse to cache any objects in this sec if
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* they're larger than max_alloc bytes, instead forwarding such objects
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* directly to the fallback.
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*/
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size_t max_alloc;
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/*
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* Exceeding this amount of cached extents in a shard causes us to start
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* flushing bins in that shard until we fall below bytes_after_flush.
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*/
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size_t max_bytes;
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/*
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* The number of bytes (in all bins) we flush down to when we exceed
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* bytes_cur. We want this to be less than bytes_cur, because
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* otherwise we could get into situations where a shard undergoing
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* net-deallocation keeps bytes_cur very near to max_bytes, so that
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* most deallocations get immediately forwarded to the underlying PAI
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* implementation, defeating the point of the SEC.
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*/
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size_t bytes_after_flush;
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/*
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* When we can't satisfy an allocation out of the SEC because there are
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* no available ones cached, we allocate multiple of that size out of
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* the fallback allocator. Eventually we might want to do something
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* cleverer, but for now we just grab a fixed number.
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*/
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size_t batch_fill_extra;
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};
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#define SEC_OPTS_DEFAULT { \
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/* nshards */ \
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4, \
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/* max_alloc */ \
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(32 * 1024) < PAGE ? PAGE : (32 * 1024), \
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/* max_bytes */ \
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256 * 1024, \
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/* bytes_after_flush */ \
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128 * 1024, \
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/* batch_fill_extra */ \
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0 \
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}
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#endif /* JEMALLOC_INTERNAL_SEC_OPTS_H */
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