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buf: Add a runningbufclaim() helper

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No functional change intended.

Reviewed by:	kib
MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D47696
This commit is contained in:
Mark Johnston 2024-11-22 13:54:08 +00:00
parent 0289db3259
commit 4efe531c9d
5 changed files with 22 additions and 18 deletions
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15
sys/kern/vfs_bio.c
View File

@ -206,7 +206,7 @@ static int sysctl_bufspace(SYSCTL_HANDLER_ARGS);
int vmiodirenable = TRUE;
SYSCTL_INT(_vfs, OID_AUTO, vmiodirenable, CTLFLAG_RW, &vmiodirenable, 0,
"Use the VM system for directory writes");
long runningbufspace;
static long runningbufspace;
SYSCTL_LONG(_vfs, OID_AUTO, runningbufspace, CTLFLAG_RD, &runningbufspace, 0,
"Amount of presently outstanding async buffer io");
SYSCTL_PROC(_vfs, OID_AUTO, bufspace, CTLTYPE_LONG|CTLFLAG_MPSAFE|CTLFLAG_RD,
@ -941,6 +941,16 @@ runningbufwakeup(struct buf *bp)
runningwakeup();
}
long
runningbufclaim(struct buf *bp, int space)
{
long old;
old = atomic_fetchadd_long(&runningbufspace, space);
bp->b_runningbufspace = space;
return (old);
}
/*
* waitrunningbufspace()
*
@ -2352,8 +2362,7 @@ bufwrite(struct buf *bp)
/*
* Normal bwrites pipeline writes
*/
bp->b_runningbufspace = bp->b_bufsize;
space = atomic_fetchadd_long(&runningbufspace, bp->b_runningbufspace);
space = runningbufclaim(bp, bp->b_bufsize);
#ifdef RACCT
if (racct_enable) {

2
sys/sys/buf.h
View File

@ -519,7 +519,6 @@ extern int nbuf; /* The number of buffer headers */
extern u_long maxswzone; /* Max KVA for swap structures */
extern u_long maxbcache; /* Max KVA for buffer cache */
extern int maxbcachebuf; /* Max buffer cache block size */
extern long runningbufspace;
extern long hibufspace;
extern int dirtybufthresh;
extern int bdwriteskip;
@ -536,6 +535,7 @@ buf_mapped(struct buf *bp)
return (bp->b_data != unmapped_buf);
}
long runningbufclaim(struct buf *, int);
void runningbufwakeup(struct buf *);
void waitrunningbufspace(void);
caddr_t kern_vfs_bio_buffer_alloc(caddr_t v, long physmem_est);

11
sys/ufs/ffs/ffs_snapshot.c
View File

@ -2343,9 +2343,8 @@ ffs_copyonwrite(struct vnode *devvp, struct buf *bp)
TAILQ_EMPTY(&sn->sn_head)) {
VI_UNLOCK(devvp);
if (saved_runningbufspace != 0) {
bp->b_runningbufspace = saved_runningbufspace;
atomic_add_long(&runningbufspace,
bp->b_runningbufspace);
(void)runningbufclaim(bp,
saved_runningbufspace);
}
return (0); /* Snapshot gone */
}
@ -2479,10 +2478,8 @@ ffs_copyonwrite(struct vnode *devvp, struct buf *bp)
/*
* I/O on bp will now be started, so count it in runningbufspace.
*/
if (saved_runningbufspace != 0) {
bp->b_runningbufspace = saved_runningbufspace;
atomic_add_long(&runningbufspace, bp->b_runningbufspace);
}
if (saved_runningbufspace != 0)
(void)runningbufclaim(bp, saved_runningbufspace);
return (error);
}

4
sys/ufs/ffs/ffs_vfsops.c
View File

@ -2517,9 +2517,7 @@ ffs_geom_strategy(struct bufobj *bo, struct buf *bp)
return;
}
}
bp->b_runningbufspace = bp->b_bufsize;
atomic_add_long(&runningbufspace,
bp->b_runningbufspace);
(void)runningbufclaim(bp, bp->b_bufsize);
} else {
error = ffs_copyonwrite(vp, bp);
if (error != 0 && error != EOPNOTSUPP) {

8
sys/vm/vnode_pager.c
View File

@ -717,8 +717,7 @@ vnode_pager_input_smlfs(vm_object_t object, vm_page_t m)
bp->b_vp = vp;
bp->b_bcount = bsize;
bp->b_bufsize = bsize;
bp->b_runningbufspace = bp->b_bufsize;
atomic_add_long(&runningbufspace, bp->b_runningbufspace);
(void)runningbufclaim(bp, bp->b_bufsize);
/* do the input */
bp->b_iooffset = dbtob(bp->b_blkno);
@ -1160,7 +1159,7 @@ vnode_pager_generic_getpages(struct vnode *vp, vm_page_t *m, int count,
bp->b_wcred = crhold(curthread->td_ucred);
pbgetbo(bo, bp);
bp->b_vp = vp;
bp->b_bcount = bp->b_bufsize = bp->b_runningbufspace = bytecount;
bp->b_bcount = bp->b_bufsize = bytecount;
bp->b_iooffset = dbtob(bp->b_blkno);
KASSERT(IDX_TO_OFF(m[0]->pindex - bp->b_pages[0]->pindex) ==
(blkno0 - bp->b_blkno) * DEV_BSIZE +
@ -1170,7 +1169,8 @@ vnode_pager_generic_getpages(struct vnode *vp, vm_page_t *m, int count,
(uintmax_t)m[0]->pindex, (uintmax_t)bp->b_pages[0]->pindex,
(uintmax_t)blkno0, (uintmax_t)bp->b_blkno));
atomic_add_long(&runningbufspace, bp->b_runningbufspace);
(void)runningbufclaim(bp, bp->b_bufsize);
VM_CNT_INC(v_vnodein);
VM_CNT_ADD(v_vnodepgsin, bp->b_npages);