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Unwire everything to the inactive queue in order to preserve LRU ordering.

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This commit is contained in:
David Greenman 1998-10-30 14:53:54 +00:00
parent 2a62931083
commit 2a78b8d1f8
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=40764
1 changed files with 12 additions and 37 deletions
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49
sys/kern/vfs_bio.c
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@ -11,7 +11,7 @@
* 2. Absolutely no warranty of function or purpose is made by the author
* John S. Dyson.
*
* $Id: vfs_bio.c,v 1.181 1998/10/28 13:36:59 dg Exp $
* $Id: vfs_bio.c,v 1.182 1998/10/29 11:04:22 dg Exp $
*/
/*
@ -794,8 +794,11 @@ vfs_vmio_release(bp)
for (i = 0; i < bp->b_npages; i++) {
m = bp->b_pages[i];
bp->b_pages[i] = NULL;
vm_page_unwire(m, (bp->b_flags & B_ASYNC) == 0 ? 0 : 1);
/*
* In order to keep page LRU ordering consistent, put
* everything on the inactive queue.
*/
vm_page_unwire(m, 0);
/*
* We don't mess with busy pages, it is
* the responsibility of the process that
@ -805,43 +808,15 @@ vfs_vmio_release(bp)
continue;
if (m->wire_count == 0) {
vm_page_flag_clear(m, PG_ZERO);
/*
* If this is an async free -- we cannot place
* pages onto the cache queue. If it is an
* async free, then we don't modify any queues.
* This is probably in error (for perf reasons),
* and we will eventually need to build
* a more complete infrastructure to support I/O
* rundown.
* Might as well free the page if we can and it has
* no valid data.
*/
if ((bp->b_flags & B_ASYNC) == 0) {
/*
* In the case of sync buffer frees, we can do pretty much
* anything to any of the memory queues. Specifically,
* the cache queue is okay to be modified.
*/
if (m->valid) {
if(m->dirty == 0)
vm_page_test_dirty(m);
/*
* this keeps pressure off of the process memory
*/
if (m->dirty == 0 && m->hold_count == 0)
vm_page_cache(m);
} else if (m->hold_count == 0) {
vm_page_busy(m);
vm_page_protect(m, VM_PROT_NONE);
vm_page_free(m);
}
} else {
/*
* If async, then at least we clear the
* act_count.
*/
m->act_count = 0;
if ((bp->b_flags & B_ASYNC) == 0 && !m->valid && m->hold_count == 0) {
vm_page_busy(m);
vm_page_protect(m, VM_PROT_NONE);
vm_page_free(m);
}
}
}