[cc Andi]
On Wed, Mar 13, 2013 at 3:08 PM, Wanpeng Li <liw...@linux.vnet.ibm.com> wrote:
> After commit 42d7395f ("mm: support more pagesizes for
> MAP_HUGETLB/SHM_HUGETLB")
> be merged, kernel permit multiple huge page sizes, and when the system
> administrator
> has configured the system to provide huge page pools of different sizes,
> application
> can choose the page size used for their allocation. However, just default
> size of
> huge page pool is statistical when memory overcommit accouting, the bad is
> that this
> will result in innocent processes be killed by oom-killer later. Fix it by
> statistic
> all huge page pools of different sizes provided by administrator.
>
Can we enrich the output of hugetlb_report_meminfo() ?
thanks
Hillf
> Testcase:
> boot: hugepagesz=1G hugepages=1
> before patch:
> egrep 'CommitLimit' /proc/meminfo
> CommitLimit: 55434168 kB
> after patch:
> egrep 'CommitLimit' /proc/meminfo
> CommitLimit: 54909880 kB
>
> Signed-off-by: Wanpeng Li <liw...@linux.vnet.ibm.com>
> ---
> mm/hugetlb.c | 7 +++++--
> 1 file changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index cdb64e4..9e25040 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -2124,8 +2124,11 @@ int hugetlb_report_node_meminfo(int nid, char *buf)
> /* Return the number pages of memory we physically have, in PAGE_SIZE units.
> */
> unsigned long hugetlb_total_pages(void)
> {
> - struct hstate *h = &default_hstate;
> - return h->nr_huge_pages * pages_per_huge_page(h);
> + struct hstate *h;
> + unsigned long nr_total_pages = 0;
> + for_each_hstate(h)
> + nr_total_pages += h->nr_huge_pages * pages_per_huge_page(h);
> + return nr_total_pages;
> }
>
> static int hugetlb_acct_memory(struct hstate *h, long delta)
> --
> 1.7.11.7
>
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