On Wed, Nov 15, 2017 at 11:14:09PM +0000, Roman Gushchin wrote: > Currently we display some hugepage statistics (total, free, etc) > in /proc/meminfo, but only for default hugepage size (e.g. 2Mb). > > If hugepages of different sizes are used (like 2Mb and 1Gb on x86-64), > /proc/meminfo output can be confusing, as non-default sized hugepages > are not reflected at all, and there are no signs that they are > existing and consuming system memory. > > To solve this problem, let's display the total amount of memory, > consumed by hugetlb pages of all sized (both free and used). > Let's call it "Hugetlb", and display size in kB to match generic > /proc/meminfo style. > > For example, (1024 2Mb pages and 2 1Gb pages are pre-allocated): > $ cat /proc/meminfo > MemTotal: 8168984 kB > MemFree: 3789276 kB > <...> > CmaFree: 0 kB > HugePages_Total: 1024 > HugePages_Free: 1024 > HugePages_Rsvd: 0 > HugePages_Surp: 0 > Hugepagesize: 2048 kB > Hugetlb: 4194304 kB > DirectMap4k: 32632 kB > DirectMap2M: 4161536 kB > DirectMap1G: 6291456 kB > > Also, this patch updates corresponding docs to reflect > Hugetlb entry meaning and difference between Hugetlb and > HugePages_Total * Hugepagesize. > > Signed-off-by: Roman Gushchin <guro@xxxxxx> > Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> > Cc: Michal Hocko <mhocko@xxxxxxxx> > Cc: Johannes Weiner <hannes@xxxxxxxxxxx> > Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx> > Cc: "Aneesh Kumar K.V" <aneesh.kumar@xxxxxxxxxxxxxxxxxx> > Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx> > Cc: Dave Hansen <dave.hansen@xxxxxxxxx> > Cc: David Rientjes <rientjes@xxxxxxxxxx> > Cc: kernel-team@xxxxxx > Cc: linux-mm@xxxxxxxxx > Cc: linux-kernel@xxxxxxxxxxxxxxx Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx> -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
