1#include "memory.h"
 2#include "common/debug.h"
 3#include "common/sysctl.h"
 4
 5#include <errno.h>
 6#include <string.h>
 7#include <sys/param.h>
 8#include <uvm/uvm_extern.h>
 9
10const char* ffDetectMemory(FFMemoryResult* ram) {
11    struct uvmexp_sysctl buf;
12    size_t length = sizeof(buf);
13    if (sysctl((int[]) { CTL_VM, VM_UVMEXP2 }, 2, &buf, &length, nullptr, 0) < 0) {
14        FF_DEBUG("sysctl(CTL_VM, VM_UVMEXP2) failed: %s", strerror(errno));
15        return "sysctl(CTL_VM, VM_UVMEXP2) failed";
16    }
17
18    ram->bytesTotal = (uint64_t) buf.npages << instance.state.platform.sysinfo.pageSizeShift;
19    ram->bytesUsed = ((uint64_t) buf.active + (uint64_t) buf.inactive + (uint64_t) buf.wired) << instance.state.platform.sysinfo.pageSizeShift;
20
21    int64_t bytesArc = ffSysctlGetInt64("kstat.zfs.misc.arcstats.size", 0);
22    if (bytesArc > 0) bytesArc -= ffSysctlGetInt64("kstat.zfs.misc.arcstats.c_min", 0);
23    if (bytesArc > 0 && (uint64_t) bytesArc < ram->bytesUsed) {
24        ram->bytesUsed -= (uint64_t) bytesArc;
25    }
26
27    return nullptr;
28}