mirror of
https://github.com/jemalloc/jemalloc.git
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2c87eff72c
This commit also migrates some detection in configure.ac into OS dipatcher since they both rely on the same preprocessor OS flags.
45 lines
1,001 B
C
45 lines
1,001 B
C
#ifndef JEMALLOC_INTERNAL_OS_FREEBSD_OVERCOMMIT_H
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#define JEMALLOC_INTERNAL_OS_FREEBSD_OVERCOMMIT_H
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#include "jemalloc/internal/jemalloc_preamble.h"
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#include <sys/mman.h>
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#include <sys/sysctl.h>
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#ifdef __FreeBSD__
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# include <vm/vm_param.h>
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#endif
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/* Defined in src/pages.c. */
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extern int mmap_flags;
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JEMALLOC_ALWAYS_INLINE bool
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os_overcommits_sysctl(void) {
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int vm_overcommit;
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size_t sz;
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sz = sizeof(vm_overcommit);
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# if defined(__FreeBSD__) && defined(VM_OVERCOMMIT)
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int mib[2];
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mib[0] = CTL_VM;
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mib[1] = VM_OVERCOMMIT;
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if (sysctl(mib, 2, &vm_overcommit, &sz, NULL, 0) != 0) {
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return false; /* Error. */
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}
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# else
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if (sysctlbyname("vm.overcommit", &vm_overcommit, &sz, NULL, 0) != 0) {
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return false; /* Error. */
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}
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# endif
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return ((vm_overcommit & 0x3) == 0);
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}
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JEMALLOC_ALWAYS_INLINE bool
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os_overcommit_boot(void) {
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mmap_flags = MAP_PRIVATE | MAP_ANON;
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os_overcommits = os_overcommits_sysctl();
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return false;
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}
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#endif /* JEMALLOC_INTERNAL_OS_FREEBSD_OVERCOMMIT_H */
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