69adae5168
try_context() is such a hot path that the hashmap lookup is expensive. The number of contexts is small - it is the number of object types. Using a hashmap is overkill. A plain array will do. Before: $ time ./journalctl --since=2014-06-01 --until=2014-07-01 > /dev/null real 0m9.445s user 0m9.228s sys 0m0.213s After: $ time ./journalctl --since=2014-06-01 --until=2014-07-01 > /dev/null real 0m5.438s user 0m5.266s sys 0m0.170s
50 lines
1.4 KiB
C
50 lines
1.4 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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#pragma once
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/***
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This file is part of systemd.
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Copyright 2012 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <inttypes.h>
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#include <stdbool.h>
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#include <sys/stat.h>
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#define MMAP_CACHE_MAX_CONTEXTS 8
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typedef struct MMapCache MMapCache;
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MMapCache* mmap_cache_new(void);
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MMapCache* mmap_cache_ref(MMapCache *m);
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MMapCache* mmap_cache_unref(MMapCache *m);
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int mmap_cache_get(
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MMapCache *m,
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int fd,
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int prot,
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unsigned context,
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bool keep_always,
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uint64_t offset,
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size_t size,
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struct stat *st,
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void **ret);
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void mmap_cache_close_fd(MMapCache *m, int fd);
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unsigned mmap_cache_get_hit(MMapCache *m);
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unsigned mmap_cache_get_missed(MMapCache *m);
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