Author: alc
Date: Sat Jan 16 04:41:40 2016
New Revision: 294130
URL: https://svnweb.freebsd.org/changeset/base/294130
Log:
A fix to r292469: Iterate over the physical segments in descending rather
than ascending order in vm_phys_alloc_contig() so that, for example, a
sequence of contigmalloc(low=0, high=4GB) calls doesn't exhaust the supply
of low physical memory resulting in a later contigmalloc(low=0, high=1MB)
failure.
Reported by: cy
Tested by: cy
Sponsored by: EMC / Isilon Storage Division
Modified:
head/sys/vm/vm_phys.c
Modified: head/sys/vm/vm_phys.c
==============================================================================
--- head/sys/vm/vm_phys.c Sat Jan 16 02:28:07 2016 (r294129)
+++ head/sys/vm/vm_phys.c Sat Jan 16 04:41:40 2016 (r294130)
@@ -1372,12 +1372,12 @@ restartdom:
return (NULL);
}
m_run = NULL;
- for (segind = 0; segind < vm_phys_nsegs; segind++) {
+ for (segind = vm_phys_nsegs - 1; segind >= 0; segind--) {
seg = &vm_phys_segs[segind];
- if (seg->start >= high)
- break;
- if (low >= seg->end || seg->domain != domain)
+ if (seg->start >= high || seg->domain != domain)
continue;
+ if (low >= seg->end)
+ break;
if (low <= seg->start)
pa_start = seg->start;
else
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