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Eliminate object locking in zfs where possible with the new lockless grab

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Reviewed by:	kib, markj, mmacy
Differential Revision:	https://reviews.freebsd.org/D23848
This commit is contained in:
Jeff Roberson 2020-02-28 20:29:53 +00:00
parent cd1da6ff8b
commit 9defe1c076
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=358443
2 changed files with 19 additions and 33 deletions
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6
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dmu.c
View File

@ -1738,11 +1738,10 @@ dmu_read_pages(objset_t *os, uint64_t object, vm_page_t *ma, int count,
#endif
vmobj = ma[0]->object;
zfs_vmobject_wlock(vmobj);
db = dbp[0];
for (i = 0; i < *rbehind; i++) {
m = vm_page_grab(vmobj, ma[0]->pindex - 1 - i,
m = vm_page_grab_unlocked(vmobj, ma[0]->pindex - 1 - i,
VM_ALLOC_NORMAL | VM_ALLOC_NOWAIT |
VM_ALLOC_SBUSY | VM_ALLOC_IGN_SBUSY);
if (m == NULL)
@ -1857,7 +1856,7 @@ dmu_read_pages(objset_t *os, uint64_t object, vm_page_t *ma, int count,
}
for (i = 0; i < *rahead; i++) {
m = vm_page_grab(vmobj, ma[count - 1]->pindex + 1 + i,
m = vm_page_grab_unlocked(vmobj, ma[count - 1]->pindex + 1 + i,
VM_ALLOC_NORMAL | VM_ALLOC_NOWAIT |
VM_ALLOC_SBUSY | VM_ALLOC_IGN_SBUSY);
if (m == NULL)
@ -1889,7 +1888,6 @@ dmu_read_pages(objset_t *os, uint64_t object, vm_page_t *ma, int count,
vm_page_sunbusy(m);
}
*rahead = i;
zfs_vmobject_wunlock(vmobj);
dmu_buf_rele_array(dbp, numbufs, FTAG);
return (0);

46
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_vnops.c
View File

@ -410,10 +410,10 @@ page_busy(vnode_t *vp, int64_t start, int64_t off, int64_t nbytes)
nbytes = end - off;
obj = vp->v_object;
zfs_vmobject_assert_wlocked(obj);
vm_page_grab_valid(&pp, obj, OFF_TO_IDX(start), VM_ALLOC_NOCREAT |
VM_ALLOC_SBUSY | VM_ALLOC_NORMAL | VM_ALLOC_IGN_SBUSY);
vm_page_grab_valid_unlocked(&pp, obj, OFF_TO_IDX(start),
VM_ALLOC_NOCREAT | VM_ALLOC_SBUSY | VM_ALLOC_NORMAL |
VM_ALLOC_IGN_SBUSY);
if (pp != NULL) {
ASSERT3U(pp->valid, ==, VM_PAGE_BITS_ALL);
vm_object_pip_add(obj, 1);
@ -439,10 +439,9 @@ page_wire(vnode_t *vp, int64_t start)
vm_page_t m;
obj = vp->v_object;
zfs_vmobject_assert_wlocked(obj);
vm_page_grab_valid(&m, obj, OFF_TO_IDX(start), VM_ALLOC_NOCREAT |
VM_ALLOC_WIRED | VM_ALLOC_IGN_SBUSY | VM_ALLOC_NOBUSY);
vm_page_grab_valid_unlocked(&m, obj, OFF_TO_IDX(start),
VM_ALLOC_NOCREAT | VM_ALLOC_WIRED | VM_ALLOC_IGN_SBUSY |
VM_ALLOC_NOBUSY);
return (m);
}
@ -475,28 +474,22 @@ update_pages(vnode_t *vp, int64_t start, int len, objset_t *os, uint64_t oid,
ASSERT(obj != NULL);
off = start & PAGEOFFSET;
zfs_vmobject_wlock(obj);
vm_object_pip_add(obj, 1);
for (start &= PAGEMASK; len > 0; start += PAGESIZE) {
vm_page_t pp;
int nbytes = imin(PAGESIZE - off, len);
if ((pp = page_busy(vp, start, off, nbytes)) != NULL) {
zfs_vmobject_wunlock(obj);
va = zfs_map_page(pp, &sf);
(void) dmu_read(os, oid, start+off, nbytes,
va+off, DMU_READ_PREFETCH);;
zfs_unmap_page(sf);
zfs_vmobject_wlock(obj);
page_unbusy(pp);
}
len -= nbytes;
off = 0;
}
vm_object_pip_wakeup(obj);
zfs_vmobject_wunlock(obj);
}
/*
@ -528,29 +521,31 @@ mappedread_sf(vnode_t *vp, int nbytes, uio_t *uio)
ASSERT(obj != NULL);
ASSERT((uio->uio_loffset & PAGEOFFSET) == 0);
zfs_vmobject_wlock(obj);
for (start = uio->uio_loffset; len > 0; start += PAGESIZE) {
int bytes = MIN(PAGESIZE, len);
pp = vm_page_grab(obj, OFF_TO_IDX(start), VM_ALLOC_SBUSY |
VM_ALLOC_NORMAL | VM_ALLOC_IGN_SBUSY);
pp = vm_page_grab_unlocked(obj, OFF_TO_IDX(start),
VM_ALLOC_SBUSY | VM_ALLOC_NORMAL | VM_ALLOC_IGN_SBUSY);
if (vm_page_none_valid(pp)) {
zfs_vmobject_wunlock(obj);
va = zfs_map_page(pp, &sf);
error = dmu_read(os, zp->z_id, start, bytes, va,
DMU_READ_PREFETCH);
if (bytes != PAGESIZE && error == 0)
bzero(va + bytes, PAGESIZE - bytes);
zfs_unmap_page(sf);
zfs_vmobject_wlock(obj);
if (error == 0) {
vm_page_valid(pp);
vm_page_activate(pp);
vm_page_sunbusy(pp);
} else {
zfs_vmobject_wlock(obj);
if (!vm_page_wired(pp) && pp->valid == 0 &&
vm_page_busy_tryupgrade(pp))
vm_page_free(pp);
else
vm_page_sunbusy(pp);
zfs_vmobject_wunlock(obj);
}
vm_page_sunbusy(pp);
if (error != 0 && !vm_page_wired(pp) &&
pp->valid == 0 && vm_page_tryxbusy(pp))
vm_page_free(pp);
} else {
ASSERT3U(pp->valid, ==, VM_PAGE_BITS_ALL);
vm_page_sunbusy(pp);
@ -561,7 +556,6 @@ mappedread_sf(vnode_t *vp, int nbytes, uio_t *uio)
uio->uio_offset += bytes;
len -= bytes;
}
zfs_vmobject_wunlock(obj);
return (error);
}
@ -592,7 +586,6 @@ mappedread(vnode_t *vp, int nbytes, uio_t *uio)
start = uio->uio_loffset;
off = start & PAGEOFFSET;
zfs_vmobject_wlock(obj);
for (start &= PAGEMASK; len > 0; start += PAGESIZE) {
vm_page_t pp;
uint64_t bytes = MIN(PAGESIZE - off, len);
@ -601,7 +594,6 @@ mappedread(vnode_t *vp, int nbytes, uio_t *uio)
struct sf_buf *sf;
caddr_t va;
zfs_vmobject_wunlock(obj);
va = zfs_map_page(pp, &sf);
#ifdef illumos
error = uiomove(va + off, bytes, UIO_READ, uio);
@ -609,20 +601,16 @@ mappedread(vnode_t *vp, int nbytes, uio_t *uio)
error = vn_io_fault_uiomove(va + off, bytes, uio);
#endif
zfs_unmap_page(sf);
zfs_vmobject_wlock(obj);
page_unwire(pp);
} else {
zfs_vmobject_wunlock(obj);
error = dmu_read_uio_dbuf(sa_get_db(zp->z_sa_hdl),
uio, bytes);
zfs_vmobject_wlock(obj);
}
len -= bytes;
off = 0;
if (error)
break;
}
zfs_vmobject_wunlock(obj);
return (error);
}