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arm64: Add fallback option during memory hot add

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Section mapping is good for TLB. But sometimes, when
system is low on physically continuous memory, this can
cause memory allocation failures. Add a fallback option to
allocate vmemmap pages from discontinuous pages.

Change-Id: Ide921c36c1e8980a8af047e2c991310405804858
Signed-off-by: Arun KS <arunks@codeaurora.org>
Signed-off-by: Vinayak Menon <vinmenon@codeaurora.org>
Signed-off-by: Sudarshan Rajagopalan <sudaraja@codeaurora.org>
[swatsrid@codeaurora.org: Fix merge conflicts]
Signed-off-by: Swathi Sridhar <swatsrid@codeaurora.org>
[isaacm@codeaurora.org: resolve build errors due to API changes]
Signed-off-by: Isaac J. Manjarres <isaacm@codeaurora.org>
This commit is contained in:
Arun KS 2017-10-09 16:39:57 +05:30 • committed by Isaac J. Manjarres
commit d4dd236a95
1 changed files with 12 additions and 3 deletions
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15
arch/arm64/mm/mmu.c
View file

@ -1116,6 +1116,7 @@ int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node,
pgd_t *pgdp;
pud_t *pudp;
pmd_t *pmdp;
int ret = 0;
do {
next = pmd_addr_end(addr, end);
@ -1133,15 +1134,23 @@ int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node,
void *p = NULL;
p = vmemmap_alloc_block_buf(PMD_SIZE, node);
if (!p)
return -ENOMEM;
if (!p) {
#ifdef CONFIG_MEMORY_HOTPLUG
vmemmap_free(start, end, altmap);
#endif
ret = -ENOMEM;
break;
}
pmd_set_huge(pmdp, __pa(p), __pgprot(PROT_SECT_NORMAL));
} else
vmemmap_verify((pte_t *)pmdp, node, addr, next);
} while (addr = next, addr != end);
return 0;
if (ret)
return vmemmap_populate_basepages(start, end, node);
else
return ret;
}
#endif /* !ARM64_SWAPPER_USES_SECTION_MAPS */
void vmemmap_free(unsigned long start, unsigned long end,