project-base/server-skynet-source-3rd-jemalloc
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Try to use sysctl(3) instead of sysctlbyname(3).

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This attempts to use VM_OVERCOMMIT OID - newly introduced in -CURRENT
few days ago, specifically for this purpose - instead of querying the
sysctl by its string name.  Due to how syctlbyname(3) works, this means
we do one syscall during binary startup instead of two.

Signed-off-by: Edward Tomasz Napierala <trasz@FreeBSD.org>
This commit is contained in:
Edward Tomasz Napierala 2017-10-26 16:55:43 +01:00 committed by David Goldblatt
parent d591df05c8
commit 9f455e2786
1 changed files with 13 additions and 0 deletions
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13
src/pages.c
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@ -10,6 +10,9 @@
#ifdef JEMALLOC_SYSCTL_VM_OVERCOMMIT
#include <sys/sysctl.h>
#ifdef __FreeBSD__
#include <vm/vm_param.h>
#endif
#endif
/******************************************************************************/
@ -375,9 +378,19 @@ os_overcommits_sysctl(void) {
size_t sz;
sz = sizeof(vm_overcommit);
#if defined(__FreeBSD__) && defined(VM_OVERCOMMIT)
int mib[2];
mib[0] = CTL_VM;
mib[1] = VM_OVERCOMMIT;
if (sysctl(mib, 2, &vm_overcommit, &sz, NULL, 0) != 0) {
return false; /* Error. */
}
#else
if (sysctlbyname("vm.overcommit", &vm_overcommit, &sz, NULL, 0) != 0) {
return false; /* Error. */
}
#endif
return ((vm_overcommit & 0x3) == 0);
}