Author: kib
Date: Fri Aug 30 20:12:23 2013
New Revision: 255080
URL: http://svnweb.freebsd.org/changeset/base/255080
Log:
Give the page allocations initiated by the swap-backed md(4) a higher
priority. If the write is requested by a system daemon, sleeping
there would starve resources and cause deadlock.
Reported and tested by: pho
Sponsored by: The FreeBSD Foundation
Modified:
head/sys/dev/md/md.c
Modified: head/sys/dev/md/md.c
==============================================================================
--- head/sys/dev/md/md.c Fri Aug 30 20:10:01 2013 (r255079)
+++ head/sys/dev/md/md.c Fri Aug 30 20:12:23 2013 (r255080)
@@ -826,7 +826,7 @@ mdstart_swap(struct md_s *sc, struct bio
vm_object_pip_add(sc->object, 1);
for (i = bp->bio_offset / PAGE_SIZE; i <= lastp; i++) {
len = ((i == lastp) ? lastend : PAGE_SIZE) - offs;
- m = vm_page_grab(sc->object, i, VM_ALLOC_NORMAL);
+ m = vm_page_grab(sc->object, i, VM_ALLOC_SYSTEM);
if (bp->bio_cmd == BIO_READ) {
if (m->valid == VM_PAGE_BITS_ALL)
rv = VM_PAGER_OK;
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