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runtime: improve free_memory implementation for OpenBSD, by getting the stats from its UVM system (#24431)

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Laurent Cheylus 2025-05-08 11:55:10 +02:00 • committed by GitHub
parent bbee42f15e
commit 656afa9d13
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1 changed files with 13 additions and 3 deletions
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16
vlib/runtime/free_memory_impl_openbsd.c.v
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@ -1,14 +1,24 @@
module runtime
#include <sys/sysctl.h>
#include <uvm/uvmexp.h>
struct C.uvmexp {
pagesize int
free int
}
fn free_memory_impl() usize {
$if cross ? {
return 1
}
$if !cross ? {
$if openbsd {
page_size := usize(C.sysconf(C._SC_PAGESIZE))
av_phys_pages := usize(C.sysconf(C._SC_AVPHYS_PAGES))
return page_size * av_phys_pages
mib := [C.CTL_VM, C.VM_UVMEXP]!
mut uvm := C.uvmexp{0, 0}
mut len := sizeof(C.uvmexp)
unsafe { C.sysctl(&mib[0], mib.len, &uvm, &len, C.NULL, 0) }
return usize(uvm.pagesize * uvm.free)
}
}
return 1