Date: Sat, 8 Mar 2025 14:47:35 -0800 From: Mark Millard <marklmi@yahoo.com> To: Rozhuk Ivan <rozhuk.im@gmail.com>, freebsd-hackers <freebsd-hackers@freebsd.org> Subject: Re: What happen with vm.v_* on stable? Message-ID: <C5C17CB5-4FCA-4455-9F47-E333A64CC335@yahoo.com> In-Reply-To: <7C1A8B0F-CBF3-45F6-9EC4-56B4AE3FFD1B@yahoo.com>
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On Mar 8, 2025, at 14:22, Mark Millard <marklmi@yahoo.com> wrote: > Rozhuk Ivan <rozhuk.im_at_gmail.com> wrote on > Date: Sat, 08 Mar 2025 17:14:16 UTC : >> >> "vm.v_free_min", "vm.v_free_reserved", and "vm.v_free_target" sysctls describeb in i386 notes and some FBSD docs. >> I try to tune it - see no effects. >> I look into code of 14/STABLE and fail to find code that read these values. > > I see reads of vm_cnt.v_free_min and vm_cnt.v_free_target and m_cnt.v_free_reserved : > > # grep -r -e "\<v_free_" -e VM_V_FREE_ -e "\<minfree\>" /usr/src/sys/ | more > . . . > /usr/src/sys/contrib/openzfs/include/os/freebsd/spl/sys/kmem.h:#define minfree vm_cnt.v_free_min > /usr/src/sys/contrib/openzfs/module/os/freebsd/zfs/arc_os.c: zfs_arc_free_target = vm_cnt.v_free_target; > /usr/src/sys/contrib/openzfs/module/os/freebsd/zfs/sysctl_os.c: if (val < minfree) > . . . > /usr/src/sys/vm/swap_pager.c: s += vm_cnt.v_page_count - vm_cnt.v_free_reserved - > . . . > /usr/src/sys/vm/vm_pageout.c: vm_cnt.v_free_reserved += vmd->vmd_free_reserved; > /usr/src/sys/vm/vm_pageout.c: vm_cnt.v_free_target += vmd->vmd_free_target; > /usr/src/sys/vm/vm_pageout.c: vm_cnt.v_free_min += vmd->vmd_free_min; > /usr/src/sys/vm/vm_pageout.c: vm_cnt.v_free_severe += vmd->vmd_free_severe; I'll note that the += vmd->vmd_free_... figures are for a memory domain, of which NUMA would means there is more than 1 domain in the system. > I see the same in both my main and my stable/14 source trees. > >> It seems it only show some initial on boot values and do nothink while OS work. > > See above. I've not analyzed the code involved, however. > >> Is some commits not backported from main to stable or it some refactor artefacts? === Mark Millard marklmi at yahoo.com === Mark Millard marklmi at yahoo.comhelp
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