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A fix to r292469: Iterate over the physical segments in descending rather

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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
This commit is contained in:
Alan Cox 2016-01-16 04:41:40 +00:00
parent f4ce06a920
commit 477bffbe4d
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=294130
1 changed files with 4 additions and 4 deletions
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8
sys/vm/vm_phys.c
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@ -1372,12 +1372,12 @@ vm_phys_alloc_contig(u_long npages, vm_paddr_t low, vm_paddr_t high,
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