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- Substitute bdone() and bwait() from vfs_bio.c for

Browse Source 
swap_pager_putpages()'s buffer completion code.  Note: the only
   difference between swp_pager_sync_iodone() and bdone(), aside from
   the locking in the latter, was the unnecessary clearing of B_ASYNC.
 - Remove an unnecessary pmap_page_protect() from
   swp_pager_async_iodone().

Reviewed by:	tegge
This commit is contained in:
Alan Cox 2004-02-23 03:15:13 +00:00
parent f71cc8681b
commit 2c840b1f65
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=126135
1 changed files with 4 additions and 23 deletions
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27
sys/vm/swap_pager.c
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@ -262,7 +262,6 @@ SYSCTL_INT(_vm, OID_AUTO, dmmax,
CTLFLAG_RD, &dmmax, 0, "Maximum size of a swap block");
static void swp_sizecheck(void);
static void swp_pager_sync_iodone(struct buf *bp);
static void swp_pager_async_iodone(struct buf *bp);
static int swapongeom(struct thread *, struct vnode *);
static int swaponvp(struct thread *, struct vnode *, u_long);
@ -1362,7 +1361,7 @@ swap_pager_putpages(vm_object_t object, vm_page_t *m, int count,
*
* NOTE: b_blkno is destroyed by the call to swapdev_strategy
*/
bp->b_iodone = swp_pager_sync_iodone;
bp->b_iodone = bdone;
swp_pager_strategy(bp);
/*
@ -1372,9 +1371,7 @@ swap_pager_putpages(vm_object_t object, vm_page_t *m, int count,
* double-free.
*/
s = splbio();
while ((bp->b_flags & B_DONE) == 0) {
tsleep(bp, PVM, "swwrt", 0);
}
bwait(bp, PVM, "swwrt");
for (j = 0; j < n; ++j)
rtvals[i+j] = VM_PAGER_PEND;
/*
@ -1387,22 +1384,6 @@ swap_pager_putpages(vm_object_t object, vm_page_t *m, int count,
VM_OBJECT_LOCK(object);
}
/*
* swap_pager_sync_iodone:
*
* Completion routine for synchronous reads and writes from/to swap.
* We just mark the bp is complete and wake up anyone waiting on it.
*
* This routine may not block. This routine is called at splbio() or better.
*/
static void
swp_pager_sync_iodone(struct buf *bp)
{
bp->b_flags |= B_DONE;
bp->b_flags &= ~B_ASYNC;
wakeup(bp);
}
/*
* swp_pager_async_iodone:
*
@ -1573,8 +1554,8 @@ swp_pager_async_iodone(struct buf *bp)
pmap_clear_modify(m);
vm_page_undirty(m);
vm_page_io_finish(m);
if (!vm_page_count_severe() || !vm_page_try_to_cache(m))
pmap_page_protect(m, VM_PROT_READ);
if (vm_page_count_severe())
vm_page_try_to_cache(m);
}
}
vm_page_unlock_queues();