Date: Thu, 12 Oct 2023 07:04:14 GMT From: Mateusz Guzik <mjg@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: a92fc3122d2b - main - vfs: count recycles by vnlru and by vn_alloc separately Message-ID: <202310120704.39C74ElD058240@gitrepo.freebsd.org>
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The branch main has been updated by mjg: URL: https://cgit.FreeBSD.org/src/commit/?id=a92fc3122d2becfbf5a627af6eda5cedfac57c31 commit a92fc3122d2becfbf5a627af6eda5cedfac57c31 Author: Mateusz Guzik <mjg@FreeBSD.org> AuthorDate: 2023-10-12 06:47:45 +0000 Commit: Mateusz Guzik <mjg@FreeBSD.org> CommitDate: 2023-10-12 06:50:07 +0000 vfs: count recycles by vnlru and by vn_alloc separately Sponsored by: Rubicon Communications, LLC ("Netgate") --- sys/kern/vfs_subr.c | 48 ++++++++++++++++++++++++++++++++++-------------- 1 file changed, 34 insertions(+), 14 deletions(-) diff --git a/sys/kern/vfs_subr.c b/sys/kern/vfs_subr.c index 01585ac9eefd..b14793ccd84e 100644 --- a/sys/kern/vfs_subr.c +++ b/sys/kern/vfs_subr.c @@ -110,7 +110,7 @@ static void delmntque(struct vnode *vp); static int flushbuflist(struct bufv *bufv, int flags, struct bufobj *bo, int slpflag, int slptimeo); static void syncer_shutdown(void *arg, int howto); -static int vtryrecycle(struct vnode *vp); +static int vtryrecycle(struct vnode *vp, bool isvnlru); static void v_init_counters(struct vnode *); static void vn_seqc_init(struct vnode *); static void vn_seqc_write_end_free(struct vnode *vp); @@ -211,6 +211,11 @@ SYSCTL_COUNTER_U64(_vfs, OID_AUTO, recycles_free, CTLFLAG_RD, &recycles_free_cou SYSCTL_COUNTER_U64(_vfs_vnode_vnlru, OID_AUTO, recycles_free, CTLFLAG_RD, &recycles_free_count, "Number of free vnodes recycled to meet vnode cache targets"); +static counter_u64_t direct_recycles_free_count; +SYSCTL_COUNTER_U64(_vfs_vnode_vnlru, OID_AUTO, direct_recycles_free, CTLFLAG_RD, + &direct_recycles_free_count, + "Number of free vnodes recycled by vn_alloc callers to meet vnode cache targets"); + static counter_u64_t vnode_skipped_requeues; SYSCTL_COUNTER_U64(_vfs_vnode_stats, OID_AUTO, skipped_requeues, CTLFLAG_RD, &vnode_skipped_requeues, "Number of times LRU requeue was skipped due to lock contention"); @@ -771,6 +776,7 @@ vntblinit(void *dummy __unused) vnodes_created = counter_u64_alloc(M_WAITOK); recycles_count = counter_u64_alloc(M_WAITOK); recycles_free_count = counter_u64_alloc(M_WAITOK); + direct_recycles_free_count = counter_u64_alloc(M_WAITOK); vnode_skipped_requeues = counter_u64_alloc(M_WAITOK); /* @@ -1317,7 +1323,7 @@ SYSCTL_INT(_vfs_vnode_vnlru, OID_AUTO, max_free_per_call, CTLFLAG_RW, * Attempt to reduce the free list by the requested amount. */ static int -vnlru_free_impl(int count, struct vfsops *mnt_op, struct vnode *mvp) +vnlru_free_impl(int count, struct vfsops *mnt_op, struct vnode *mvp, bool isvnlru) { struct vnode *vp; struct mount *mp; @@ -1403,7 +1409,7 @@ vnlru_free_impl(int count, struct vfsops *mnt_op, struct vnode *mvp) * * Check nullfs for one example (null_getwritemount). */ - vtryrecycle(vp); + vtryrecycle(vp, isvnlru); count--; if (count == 0) { break; @@ -1419,22 +1425,33 @@ vnlru_free_impl(int count, struct vfsops *mnt_op, struct vnode *mvp) * XXX: returns without vnode_list_mtx locked! */ static int -vnlru_free_locked(int count) +vnlru_free_locked_direct(int count) { int ret; mtx_assert(&vnode_list_mtx, MA_OWNED); - ret = vnlru_free_impl(count, NULL, vnode_list_free_marker); + ret = vnlru_free_impl(count, NULL, vnode_list_free_marker, false); mtx_assert(&vnode_list_mtx, MA_NOTOWNED); return (ret); } static int -vnlru_free(int count) +vnlru_free_locked_vnlru(int count) +{ + int ret; + + mtx_assert(&vnode_list_mtx, MA_OWNED); + ret = vnlru_free_impl(count, NULL, vnode_list_free_marker, true); + mtx_assert(&vnode_list_mtx, MA_NOTOWNED); + return (ret); +} + +static int +vnlru_free_vnlru(int count) { mtx_lock(&vnode_list_mtx); - return (vnlru_free_locked(count)); + return (vnlru_free_locked_vnlru(count)); } void @@ -1445,7 +1462,7 @@ vnlru_free_vfsops(int count, struct vfsops *mnt_op, struct vnode *mvp) MPASS(mvp != NULL); VNPASS(mvp->v_type == VMARKER, mvp); mtx_lock(&vnode_list_mtx); - vnlru_free_impl(count, mnt_op, mvp); + vnlru_free_impl(count, mnt_op, mvp, true); mtx_assert(&vnode_list_mtx, MA_NOTOWNED); } @@ -1702,7 +1719,7 @@ vnlru_proc_light(void) return (false); if (freecount != 0) { - vnlru_free(freecount); + vnlru_free_vnlru(freecount); } mtx_lock(&vnode_list_mtx); @@ -1748,7 +1765,7 @@ vnlru_proc(void) * try to reduce it by discarding from the free list. */ if (rnumvnodes > desiredvnodes + 10) { - vnlru_free_locked(rnumvnodes - desiredvnodes); + vnlru_free_locked_vnlru(rnumvnodes - desiredvnodes); mtx_lock(&vnode_list_mtx); rnumvnodes = atomic_load_long(&numvnodes); } @@ -1848,7 +1865,7 @@ SYSINIT(vnlru, SI_SUB_KTHREAD_UPDATE, SI_ORDER_FIRST, kproc_start, * through vgone(). */ static int -vtryrecycle(struct vnode *vp) +vtryrecycle(struct vnode *vp, bool isvnlru) { struct mount *vnmp; @@ -1893,7 +1910,10 @@ vtryrecycle(struct vnode *vp) return (EBUSY); } if (!VN_IS_DOOMED(vp)) { - counter_u64_add(recycles_free_count, 1); + if (isvnlru) + counter_u64_add(recycles_free_count, 1); + else + counter_u64_add(direct_recycles_free_count, 1); vgonel(vp); } VOP_UNLOCK(vp); @@ -1966,7 +1986,7 @@ vn_alloc_hard(struct mount *mp, u_long rnumvnodes, bool bumped) * should be chosen so that we never wait or even reclaim from * the free list to below its target minimum. */ - if (vnlru_free_locked(1) > 0) + if (vnlru_free_locked_direct(1) > 0) goto alloc; mtx_assert(&vnode_list_mtx, MA_NOTOWNED); if (mp == NULL || (mp->mnt_kern_flag & MNTK_SUSPEND) == 0) { @@ -1983,7 +2003,7 @@ vn_alloc_hard(struct mount *mp, u_long rnumvnodes, bool bumped) msleep(&vnlruproc_sig, &vnode_list_mtx, PVFS, "vlruwk", hz); if (atomic_load_long(&numvnodes) + 1 > desiredvnodes && vnlru_read_freevnodes() > 1) - vnlru_free_locked(1); + vnlru_free_locked_direct(1); else mtx_unlock(&vnode_list_mtx); }
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