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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. Link: http://lkml.kernel.org/r/20171115231409.12131-1-guro@fb.com Signed-off-by: Roman Gushchin <guro@fb.com> Acked-by: Michal Hocko <mhocko@suse.com> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Acked-by: David Rientjes <rientjes@google.com> Cc: Mike Kravetz <mike.kravetz@oracle.com> Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Dave Hansen <dave.hansen@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.