Control: tag -1 upstream moreinfo
On Wed, 2013-02-06 at 18:02 +0100, Bernhard Schmidt wrote:
> Package: src:linux
> Version: 3.2.35-2
> Severity: normal
>
> Adding additional RAM to a virtual machine running Debian Wheezy on
> VMware ESXi 5.0 often, but not always leads to the attached backtrace.
>
> If that happens, the system has considerably less new (offline) memory
> banks in /sys/devices/system/memory/memory* than it should have, and
> setting all available memory banks online does not give all the memory
> expected.
[...]
Please test whether the attached patch fixes this. Instructions for
building a patched kernel package are in the Debian kernel handbook:
<http://kernel-handbook.alioth.debian.org/ch-common-tasks.html#s-common-official>.
Ben.
--
Ben Hutchings
We get into the habit of living before acquiring the habit of thinking.
- Albert Camus
From: Ben Hutchings <ben@decadent.org.uk> Date: Mon, 11 Feb 2013 00:56:24 +0000 Subject: [PATCH] mm: Try harder to allocate vmemmap blocks Hot-adding memory on x86_64 normally requires huge page allocation. When this is done to a VM guest, it's usually because the system is already tight on memory, so the request tends to fail. Try to avoid this by adding __GFP_REPEAT to the allocation flags. Reported-by: Bernhard Schmidt <Bernhard.Schmidt@lrz.de> Reference: http://bugs.debian.org/699913 Signed-off-by: Ben Hutchings <ben@decadent.org.uk> --- mm/sparse-vmemmap.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/mm/sparse-vmemmap.c b/mm/sparse-vmemmap.c index 1b7e22a..22b7e18 100644 --- a/mm/sparse-vmemmap.c +++ b/mm/sparse-vmemmap.c @@ -53,10 +53,12 @@ void * __meminit vmemmap_alloc_block(unsigned long size, int node) struct page *page; if (node_state(node, N_HIGH_MEMORY)) - page = alloc_pages_node(node, - GFP_KERNEL | __GFP_ZERO, get_order(size)); + page = alloc_pages_node( + node, GFP_KERNEL | __GFP_ZERO | __GFP_REPEAT, + get_order(size)); else - page = alloc_pages(GFP_KERNEL | __GFP_ZERO, + page = alloc_pages( + GFP_KERNEL | __GFP_ZERO | __GFP_REPEAT, get_order(size)); if (page) return page_address(page);
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