On Fri, Nov 19, 2010 at 04:33:51PM -0700, Eric B Munson wrote:
> Since 2.6.32 the kernel has supported pseudo-anonymous mmaps for
> huge pages without having hugetlbfs mounted. This patch adds a
> check for that kernel feature.
>
> Signed-off-by: Eric B Munson <emun...@mgebm.net>
> ---
> kernel-features.c | 4 ++++
> libhugetlbfs_privutils.h | 3 +++
> 2 files changed, 7 insertions(+), 0 deletions(-)
>
> diff --git a/kernel-features.c b/kernel-features.c
> index 09d0486..b8cdec9 100644
> --- a/kernel-features.c
> +++ b/kernel-features.c
> @@ -44,6 +44,10 @@ static struct feature kernel_features[] = {
> [HUGETLB_FEATURE_SAFE_NORESERVE] = {
> .name = "noreserve_safe",
> .required_version = "2.6.34",
> + },
> + [HUGETLB_FEATURE_MAP_HUGETLB] = {
> + .name = "map_hugetlb",
> + .required_version = "2.6.32",
> }
> };
>
> diff --git a/libhugetlbfs_privutils.h b/libhugetlbfs_privutils.h
> index aaa638f..a693c24 100644
> --- a/libhugetlbfs_privutils.h
> +++ b/libhugetlbfs_privutils.h
> @@ -80,6 +80,9 @@ enum {
> /* Whether use of MAP_NORESERVE is safe or can result in OOM */
> HUGETLB_FEATURE_SAFE_NORESERVE,
>
> + /* If the kernel has the ability to mmap huge pages without a mount */
> + HUGETLB_FEATURE_MAP_HUGETLB,
> +
make it mma
If the kernel has the ability to mmap(MAP_HUGETLB)
It was possible to map shared memory without a mount before and while I
know that's not mmap(), the current comment is fuzzy. Otherwise
Acked-by: Mel Gorman <m...@csn.ul.ie>
> HUGETLB_FEATURE_NR,
> };
> #define hugetlbfs_test_feature __pu_hugetlbfs_test_feature
--
Mel Gorman
Part-time Phd Student Linux Technology Center
University of Limerick IBM Dublin Software Lab
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