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Add a helper function for testing a swap block and freeing it if empty.

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Submitted by: ota_j.email.ne.jp
Approved by: alc, kib, dougm
Differential Revision: https://reviews.freebsd.org/D22402
This commit is contained in:
Doug Moore 2019-11-17 18:38:37 +00:00
parent 8a19cf92cf
commit abdab7b633
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=354795
1 changed files with 19 additions and 10 deletions
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29
sys/vm/swap_pager.c
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@ -407,6 +407,7 @@ SYSCTL_INT(_vm, OID_AUTO, dmmax, CTLFLAG_RD, &nsw_cluster_max, 0,
static void swp_sizecheck(void);
static void swp_pager_async_iodone(struct buf *bp);
static bool swp_pager_swblk_empty(struct swblk *sb, int start, int limit);
static void swp_pager_free_empty_swblk(vm_object_t, struct swblk *sb);
static int swapongeom(struct vnode *);
static int swaponvp(struct thread *, struct vnode *, u_long);
static int swapoff_one(struct swdevt *sp, struct ucred *cred);
@ -1872,6 +1873,21 @@ swp_pager_swblk_empty(struct swblk *sb, int start, int limit)
}
return (true);
}
/*
* SWP_PAGER_FREE_EMPTY_SWBLK() - frees if a block is free
*
* Nothing is done if the block is still in use.
*/
static void
swp_pager_free_empty_swblk(vm_object_t object, struct swblk *sb)
{
if (swp_pager_swblk_empty(sb, 0, SWAP_META_PAGES)) {
SWAP_PCTRIE_REMOVE(&object->un_pager.swp.swp_blks, sb->p);
uma_zfree(swblk_zone, sb);
}
}
/*
* SWP_PAGER_META_BUILD() - add swap block to swap meta data for object
@ -1990,11 +2006,8 @@ swp_pager_meta_build(vm_object_t object, vm_pindex_t pindex, daddr_t swapblk)
/*
* Free the swblk if we end up with the empty page run.
*/
if (swapblk == SWAPBLK_NONE &&
swp_pager_swblk_empty(sb, 0, SWAP_META_PAGES)) {
SWAP_PCTRIE_REMOVE(&object->un_pager.swp.swp_blks, rdpi);
uma_zfree(swblk_zone, sb);
}
if (swapblk == SWAPBLK_NONE)
swp_pager_free_empty_swblk(object, sb);
return (prev_swapblk);
}
@ -2140,11 +2153,7 @@ swp_pager_meta_ctl(vm_object_t object, vm_pindex_t pindex, int flags)
return (SWAPBLK_NONE);
if ((flags & SWM_POP) != 0) {
sb->d[pindex % SWAP_META_PAGES] = SWAPBLK_NONE;
if (swp_pager_swblk_empty(sb, 0, SWAP_META_PAGES)) {
SWAP_PCTRIE_REMOVE(&object->un_pager.swp.swp_blks,
rounddown(pindex, SWAP_META_PAGES));
uma_zfree(swblk_zone, sb);
}
swp_pager_free_empty_swblk(object, sb);
}
return (r1);
}