d/freebsd-skq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
8b0f6c4215
freebsd-skq/sys/ufs/ffs/ffs_rawread.c
Gleb Smirnoff 756a541279 Allocate pager bufs from UMA instead of 80-ish mutex protected linked list. 
o In vm_pager_bufferinit() create pbuf_zone and start accounting on how many
  pbufs are we going to have set.
  In various subsystems that are going to utilize pbufs create private zones
  via call to pbuf_zsecond_create(). The latter calls uma_zsecond_create(),
  and sets a limit on created zone. After startup preallocate pbufs according
  to requirements of all pbuf zones.

  Subsystems that used to have a private limit with old allocator now have
  private pbuf zones: md(4), fusefs, NFS client, smbfs, VFS cluster, FFS,
  swap, vnode pager.

  The following subsystems use shared pbuf zone: cam(4), nvme(4), physio(9),
  aio(4). They should have their private limits, but changing that is out of
  scope of this commit.

o Fetch tunable value of kern.nswbuf from init_param2() and while here move
  NSWBUF_MIN to opt_param.h and eliminate opt_swap.h, that was holding only
  this option.
  Default values aren't touched by this commit, but they probably should be
  reviewed wrt to modern hardware.

This change removes a tight bottleneck from sendfile(2) operation, that
uses pbufs in vnode pager. Other pagers also would benefit from faster
allocation.

Together with:	gallatin
Tested by:	pho
2019-01-15 01:02:16 +00:00

476 lines
12 KiB
C
Raw Blame History

/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2000-2003 Tor Egge
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/fcntl.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/proc.h>
#include <sys/limits.h>
#include <sys/mount.h>
#include <sys/namei.h>
#include <sys/vnode.h>
#include <sys/conf.h>
#include <sys/filio.h>
#include <sys/ttycom.h>
#include <sys/bio.h>
#include <sys/buf.h>
#include <sys/rwlock.h>
#include <ufs/ufs/extattr.h>
#include <ufs/ufs/quota.h>
#include <ufs/ufs/inode.h>
#include <ufs/ufs/ufsmount.h>
#include <ufs/ufs/ufs_extern.h>
#include <ufs/ffs/fs.h>
#include <ufs/ffs/ffs_extern.h>
#include <vm/vm.h>
#include <vm/vm_extern.h>
#include <vm/vm_object.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>
static int ffs_rawread_readahead(struct vnode *vp,
caddr_t udata,
off_t offset,
size_t len,
struct thread *td,
struct buf *bp);
static int ffs_rawread_main(struct vnode *vp,
struct uio *uio);
static int ffs_rawread_sync(struct vnode *vp);
int ffs_rawread(struct vnode *vp, struct uio *uio, int *workdone);
SYSCTL_DECL(_vfs_ffs);
static uma_zone_t ffsraw_pbuf_zone;
static int allowrawread = 1;
SYSCTL_INT(_vfs_ffs, OID_AUTO, allowrawread, CTLFLAG_RW, &allowrawread, 0,
"Flag to enable raw reads");
static int rawreadahead = 1;
SYSCTL_INT(_vfs_ffs, OID_AUTO, rawreadahead, CTLFLAG_RW, &rawreadahead, 0,
"Flag to enable readahead for long raw reads");
static void
ffs_rawread_setup(void *arg __unused)
{
ffsraw_pbuf_zone = pbuf_zsecond_create("ffsrawpbuf",
(nswbuf > 100 ) ? (nswbuf - (nswbuf >> 4)) : nswbuf - 8);
}
SYSINIT(ffs_raw, SI_SUB_VM_CONF, SI_ORDER_ANY, ffs_rawread_setup, NULL);
static int
ffs_rawread_sync(struct vnode *vp)
{
int error;
int upgraded;
struct bufobj *bo;
struct mount *mp;
vm_object_t obj;
/* Check for dirty mmap, pending writes and dirty buffers */
bo = &vp->v_bufobj;
BO_LOCK(bo);
VI_LOCK(vp);
if (bo->bo_numoutput > 0 ||
bo->bo_dirty.bv_cnt > 0 ||
((obj = vp->v_object) != NULL &&
(obj->flags & OBJ_MIGHTBEDIRTY) != 0)) {
VI_UNLOCK(vp);
BO_UNLOCK(bo);
if (vn_start_write(vp, &mp, V_NOWAIT) != 0) {
if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE)
upgraded = 1;
else
upgraded = 0;
VOP_UNLOCK(vp, 0);
(void) vn_start_write(vp, &mp, V_WAIT);
VOP_LOCK(vp, LK_EXCLUSIVE);
} else if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) {
upgraded = 1;
/* Upgrade to exclusive lock, this might block */
VOP_LOCK(vp, LK_UPGRADE);
} else
upgraded = 0;
VI_LOCK(vp);
/* Check if vnode was reclaimed while unlocked. */
if ((vp->v_iflag & VI_DOOMED) != 0) {
VI_UNLOCK(vp);
if (upgraded != 0)
VOP_LOCK(vp, LK_DOWNGRADE);
vn_finished_write(mp);
return (EIO);
}
/* Attempt to msync mmap() regions to clean dirty mmap */
if ((obj = vp->v_object) != NULL &&
(obj->flags & OBJ_MIGHTBEDIRTY) != 0) {
VI_UNLOCK(vp);
VM_OBJECT_WLOCK(obj);
vm_object_page_clean(obj, 0, 0, OBJPC_SYNC);
VM_OBJECT_WUNLOCK(obj);
} else
VI_UNLOCK(vp);
/* Wait for pending writes to complete */
BO_LOCK(bo);
error = bufobj_wwait(&vp->v_bufobj, 0, 0);
if (error != 0) {
/* XXX: can't happen with a zero timeout ??? */
BO_UNLOCK(bo);
if (upgraded != 0)
VOP_LOCK(vp, LK_DOWNGRADE);
vn_finished_write(mp);
return (error);
}
/* Flush dirty buffers */
if (bo->bo_dirty.bv_cnt > 0) {
BO_UNLOCK(bo);
if ((error = ffs_syncvnode(vp, MNT_WAIT, 0)) != 0) {
if (upgraded != 0)
VOP_LOCK(vp, LK_DOWNGRADE);
vn_finished_write(mp);
return (error);
}
BO_LOCK(bo);
if (bo->bo_numoutput > 0 || bo->bo_dirty.bv_cnt > 0)
panic("ffs_rawread_sync: dirty bufs");
}
BO_UNLOCK(bo);
if (upgraded != 0)
VOP_LOCK(vp, LK_DOWNGRADE);
vn_finished_write(mp);
} else {
VI_UNLOCK(vp);
BO_UNLOCK(bo);
}
return 0;
}
static int
ffs_rawread_readahead(struct vnode *vp,
caddr_t udata,
off_t offset,
size_t len,
struct thread *td,
struct buf *bp)
{
int error;
u_int iolen;
off_t blockno;
int blockoff;
int bsize;
struct vnode *dp;
int bforwards;
struct inode *ip;
ufs2_daddr_t blkno;
bsize = vp->v_mount->mnt_stat.f_iosize;
ip = VTOI(vp);
dp = ITODEVVP(ip);
iolen = ((vm_offset_t) udata) & PAGE_MASK;
bp->b_bcount = len;
if (bp->b_bcount + iolen > bp->b_kvasize) {
bp->b_bcount = bp->b_kvasize;
if (iolen != 0)
bp->b_bcount -= PAGE_SIZE;
}
bp->b_flags = 0; /* XXX necessary ? */
bp->b_iocmd = BIO_READ;
bp->b_iodone = bdone;
bp->b_data = udata;
blockno = offset / bsize;
blockoff = (offset % bsize) / DEV_BSIZE;
if ((daddr_t) blockno != blockno) {
return EINVAL; /* blockno overflow */
}
bp->b_lblkno = bp->b_blkno = blockno;
error = ufs_bmaparray(vp, bp->b_lblkno, &blkno, NULL, &bforwards, NULL);
if (error != 0)
return error;
if (blkno == -1) {
/* Fill holes with NULs to preserve semantics */
if (bp->b_bcount + blockoff * DEV_BSIZE > bsize)
bp->b_bcount = bsize - blockoff * DEV_BSIZE;
bp->b_bufsize = bp->b_bcount;
if (vmapbuf(bp, 1) < 0)
return EFAULT;
maybe_yield();
bzero(bp->b_data, bp->b_bufsize);
/* Mark operation completed (similar to bufdone()) */
bp->b_resid = 0;
bp->b_flags |= B_DONE;
return 0;
}
bp->b_blkno = blkno + blockoff;
bp->b_offset = bp->b_iooffset = (blkno + blockoff) * DEV_BSIZE;
if (bp->b_bcount + blockoff * DEV_BSIZE > bsize * (1 + bforwards))
bp->b_bcount = bsize * (1 + bforwards) - blockoff * DEV_BSIZE;
bp->b_bufsize = bp->b_bcount;
if (vmapbuf(bp, 1) < 0)
return EFAULT;
BO_STRATEGY(&dp->v_bufobj, bp);
return 0;
}
static int
ffs_rawread_main(struct vnode *vp,
struct uio *uio)
{
int error, nerror;
struct buf *bp, *nbp, *tbp;
u_int iolen;
caddr_t udata;
long resid;
off_t offset;
struct thread *td;
td = uio->uio_td ? uio->uio_td : curthread;
udata = uio->uio_iov->iov_base;
resid = uio->uio_resid;
offset = uio->uio_offset;
/*
* keep the process from being swapped
*/
PHOLD(td->td_proc);
error = 0;
nerror = 0;
bp = NULL;
nbp = NULL;
while (resid > 0) {
if (bp == NULL) { /* Setup first read */
bp = uma_zalloc(ffsraw_pbuf_zone, M_WAITOK);
pbgetvp(vp, bp);
error = ffs_rawread_readahead(vp, udata, offset,
resid, td, bp);
if (error != 0)
break;
if (resid > bp->b_bufsize) { /* Setup fist readahead */
if (rawreadahead != 0)
nbp = uma_zalloc(ffsraw_pbuf_zone,
M_NOWAIT);
else
nbp = NULL;
if (nbp != NULL) {
pbgetvp(vp, nbp);
nerror = ffs_rawread_readahead(vp,
udata +
bp->b_bufsize,
offset +
bp->b_bufsize,
resid -
bp->b_bufsize,
td,
nbp);
if (nerror) {
pbrelvp(nbp);
uma_zfree(ffsraw_pbuf_zone,
nbp);
nbp = NULL;
}
}
}
}
bwait(bp, PRIBIO, "rawrd");
vunmapbuf(bp);
iolen = bp->b_bcount - bp->b_resid;
if (iolen == 0 && (bp->b_ioflags & BIO_ERROR) == 0) {
nerror = 0; /* Ignore possible beyond EOF error */
break; /* EOF */
}
if ((bp->b_ioflags & BIO_ERROR) != 0) {
error = bp->b_error;
break;
}
resid -= iolen;
udata += iolen;
offset += iolen;
if (iolen < bp->b_bufsize) {
/* Incomplete read. Try to read remaining part */
error = ffs_rawread_readahead(vp,
udata,
offset,
bp->b_bufsize - iolen,
td,
bp);
if (error != 0)
break;
} else if (nbp != NULL) { /* Complete read with readahead */
tbp = bp;
bp = nbp;
nbp = tbp;
if (resid <= bp->b_bufsize) { /* No more readaheads */
pbrelvp(nbp);
uma_zfree(ffsraw_pbuf_zone, nbp);
nbp = NULL;
} else { /* Setup next readahead */
nerror = ffs_rawread_readahead(vp,
udata +
bp->b_bufsize,
offset +
bp->b_bufsize,
resid -
bp->b_bufsize,
td,
nbp);
if (nerror != 0) {
pbrelvp(nbp);
uma_zfree(ffsraw_pbuf_zone, nbp);
nbp = NULL;
}
}
} else if (nerror != 0) {/* Deferred Readahead error */
break;
} else if (resid > 0) { /* More to read, no readahead */
error = ffs_rawread_readahead(vp, udata, offset,
resid, td, bp);
if (error != 0)
break;
}
}
if (bp != NULL) {
pbrelvp(bp);
uma_zfree(ffsraw_pbuf_zone, bp);
}
if (nbp != NULL) { /* Run down readahead buffer */
bwait(nbp, PRIBIO, "rawrd");
vunmapbuf(nbp);
pbrelvp(nbp);
uma_zfree(ffsraw_pbuf_zone, nbp);
}
if (error == 0)
error = nerror;
PRELE(td->td_proc);
uio->uio_iov->iov_base = udata;
uio->uio_resid = resid;
uio->uio_offset = offset;
return error;
}
int
ffs_rawread(struct vnode *vp,
struct uio *uio,
int *workdone)
{
if (allowrawread != 0 &&
uio->uio_iovcnt == 1 &&
uio->uio_segflg == UIO_USERSPACE &&
uio->uio_resid == uio->uio_iov->iov_len &&
(((uio->uio_td != NULL) ? uio->uio_td : curthread)->td_pflags &
TDP_DEADLKTREAT) == 0) {
int secsize; /* Media sector size */
off_t filebytes; /* Bytes left of file */
int blockbytes; /* Bytes left of file in full blocks */
int partialbytes; /* Bytes in last partial block */
int skipbytes; /* Bytes not to read in ffs_rawread */
struct inode *ip;
int error;
/* Only handle sector aligned reads */
ip = VTOI(vp);
secsize = ITODEVVP(ip)->v_bufobj.bo_bsize;
if ((uio->uio_offset & (secsize - 1)) == 0 &&
(uio->uio_resid & (secsize - 1)) == 0) {
/* Sync dirty pages and buffers if needed */
error = ffs_rawread_sync(vp);
if (error != 0)
return error;
/* Check for end of file */
if (ip->i_size > uio->uio_offset) {
filebytes = ip->i_size - uio->uio_offset;
/* No special eof handling needed ? */
if (uio->uio_resid <= filebytes) {
*workdone = 1;
return ffs_rawread_main(vp, uio);
}
partialbytes = ((unsigned int) ip->i_size) %
ITOFS(ip)->fs_bsize;
blockbytes = (int) filebytes - partialbytes;
if (blockbytes > 0) {
skipbytes = uio->uio_resid -
blockbytes;
uio->uio_resid = blockbytes;
error = ffs_rawread_main(vp, uio);
uio->uio_resid += skipbytes;
if (error != 0)
return error;
/* Read remaining part using buffer */
}
}
}
}
*workdone = 0;
return 0;
}
Reference in New Issue View Git Blame Copy Permalink