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2015-09-08pagemap: add mmap-exclusive bit for marking pages mapped only hereKonstantin Khlebnikov1-0/+10
This patch sets bit 56 in pagemap if this page is mapped only once. It allows to detect exclusively used pages without exposing PFN: present file exclusive state 0 0 0 non-present 1 1 0 file page mapped somewhere else 1 1 1 file page mapped only here 1 0 0 anon non-CoWed page (shared with parent/child) 1 0 1 anon CoWed page (or never forked) CoWed pages in (MAP_FILE | MAP_PRIVATE) areas are anon in this context. MMap-exclusive bit doesn't reflect potential page-sharing via swapcache: page could be mapped once but has several swap-ptes which point to it. Application could detect that by swap bit in pagemap entry and touch that pte via /proc/pid/mem to get real information. See http://lkml.kernel.org/r/CAEVpBa+_RyACkhODZrRvQLs80iy0sqpdrd0AaP_-tgnX3Y9yNQ@mail.gmail.com Requested by Mark Williamson. [akpm@linux-foundation.org: fix spello] Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru> Reviewed-by: Mark Williamson <mwilliamson@undo-software.com> Tested-by: Mark Williamson <mwilliamson@undo-software.com> Reviewed-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2015-09-08pagemap: switch to the new format and do some cleanupKonstantin Khlebnikov1-17/+8
This patch removes page-shift bits (scheduled to remove since 3.11) and completes migration to the new bit layout. Also it cleans messy macro. Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru> Reviewed-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: Mark Williamson <mwilliamson@undo-software.com> Tested-by: Mark Williamson <mwilliamson@undo-software.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2015-05-14tools/vm: fix page-flags buildAndi Kleen1-1/+1
libabikfs.a doesn't exist anymore, so we now need to link with libapi.a. Signed-off-by: Andi Kleen <ak@linux.intel.com> Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2015-02-11mm:add KPF_ZERO_PAGE flag for /proc/kpageflagsWang, Yalin1-0/+1
Add KPF_ZERO_PAGE flag for zero_page, so that userspace processes can detect zero_page in /proc/kpageflags, and then do memory analysis more accurately. Signed-off-by: Yalin Wang <yalin.wang@sonymobile.com> Acked-by: Kirill A. Shutemov <kirill@shutemov.name> Cc: Konstantin Khlebnikov <koct9i@gmail.com> Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-12-13mm/page_owner: keep track of page ownersJoonsoo Kim2-2/+146
This is the page owner tracking code which is introduced so far ago. It is resident on Andrew's tree, though, nobody tried to upstream so it remain as is. Our company uses this feature actively to debug memory leak or to find a memory hogger so I decide to upstream this feature. This functionality help us to know who allocates the page. When allocating a page, we store some information about allocation in extra memory. Later, if we need to know status of all pages, we can get and analyze it from this stored information. In previous version of this feature, extra memory is statically defined in struct page, but, in this version, extra memory is allocated outside of struct page. It enables us to turn on/off this feature at boottime without considerable memory waste. Although we already have tracepoint for tracing page allocation/free, using it to analyze page owner is rather complex. We need to enlarge the trace buffer for preventing overlapping until userspace program launched. And, launched program continually dump out the trace buffer for later analysis and it would change system behaviour with more possibility rather than just keeping it in memory, so bad for debug. Moreover, we can use page_owner feature further for various purposes. For example, we can use it for fragmentation statistics implemented in this patch. And, I also plan to implement some CMA failure debugging feature using this interface. I'd like to give the credit for all developers contributed this feature, but, it's not easy because I don't know exact history. Sorry about that. Below is people who has "Signed-off-by" in the patches in Andrew's tree. Contributor: Alexander Nyberg <alexn@dsv.su.se> Mel Gorman <mgorman@suse.de> Dave Hansen <dave@linux.vnet.ibm.com> Minchan Kim <minchan@kernel.org> Michal Nazarewicz <mina86@mina86.com> Andrew Morton <akpm@linux-foundation.org> Jungsoo Son <jungsoo.son@lge.com> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Minchan Kim <minchan@kernel.org> Cc: Dave Hansen <dave@sr71.net> Cc: Michal Nazarewicz <mina86@mina86.com> Cc: Jungsoo Son <jungsoo.son@lge.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-10-09mm/balloon_compaction: add vmstat counters and kpageflags bitKonstantin Khlebnikov1-0/+1
Always mark pages with PageBalloon even if balloon compaction is disabled and expose this mark in /proc/kpageflags as KPF_BALLOON. Also this patch adds three counters into /proc/vmstat: "balloon_inflate", "balloon_deflate" and "balloon_migrate". They accumulate balloon activity. Current size of balloon is (balloon_inflate - balloon_deflate) pages. All generic balloon code now gathered under option CONFIG_MEMORY_BALLOON. It should be selected by ballooning driver which wants use this feature. Currently virtio-balloon is the only user. Signed-off-by: Konstantin Khlebnikov <k.khlebnikov@samsung.com> Cc: Rafael Aquini <aquini@redhat.com> Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-06-04tools/vm/page-types.c: catch sigbus if raced with truncateKonstantin Khlebnikov1-3/+32
Recently added page-cache dumping is known to be a little bit racy. But after race with truncate it just dies due to unhandled SIGBUS when it tries to poke pages beyond the new end of file. This patch adds handler for SIGBUS which skips the rest of the file. Signed-off-by: Konstantin Khlebnikov <koct9i@gmail.com> Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-04-07tools/vm/page-types.c: page-cache sniffing featureKonstantin Khlebnikov1-18/+152
After this patch 'page-types' can walk over a file's mappings and analyze populated page cache pages mostly without disturbing its state. It maps chunk of file, marks VMA as MADV_RANDOM to turn off readahead, pokes VMA via mincore() to determine cached pages, triggers page-fault only for them, and finally gathers information via pagemap/kpageflags. Before unmap it marks VMA as MADV_SEQUENTIAL for ignoring reference bits. usage: page-types -f <path> If <path> is directory it will analyse all files in all subdirectories. Symlinks are not followed as well as mount points. Hardlinks aren't handled, they'll be dumped as many times as they are found. Recursive walk brings all dentries into dcache and populates page cache of block-devices aka 'Buffers'. Probably it's worth to add ioctl for dumping file page cache as array of PFNs as a replacement for this hackish juggling with mmap/madvise/mincore/pagemap. Also recursive walk could be replaced with dumping cached inodes via some ioctl or debugfs interface followed by openning them via open_by_handle_at, this would fix hardlinks handling and unneeded population of dcache and buffers. This interface might be used as data source for constructing readahead plans and for background optimizations of actively used files. collateral changes: + fix 64-bit LFS: define _FILE_OFFSET_BITS instead of _LARGEFILE64_SOURCE + replace lseek + read with single pread + make show_page_range() reusable after flush usage example: ~/src/linux/tools/vm$ sudo ./page-types -L -f page-types foffset offset flags page-types Inode: 2229277 Size: 89065 (22 pages) Modify: Tue Feb 25 12:00:59 2014 (162 seconds ago) Access: Tue Feb 25 12:01:00 2014 (161 seconds ago) 0 3cbf3b __RU_lA____M________________________ 1 38946a __RU_lA____M________________________ 2 1a3cec __RU_lA____M________________________ 3 1a8321 __RU_lA____M________________________ 4 3af7cc __RU_lA____M________________________ 5 1ed532 __RU_lA_____________________________ 6 2e436a __RU_lA_____________________________ 7 29a35e ___U_lA_____________________________ 8 2de86e ___U_lA_____________________________ 9 3bdfb4 ___U_lA_____________________________ 10 3cd8a3 ___U_lA_____________________________ 11 2afa50 ___U_lA_____________________________ 12 2534c2 ___U_lA_____________________________ 13 1b7a40 ___U_lA_____________________________ 14 17b0be ___U_lA_____________________________ 15 392b0c ___U_lA_____________________________ 16 3ba46a __RU_lA_____________________________ 17 397dc8 ___U_lA_____________________________ 18 1f2a36 ___U_lA_____________________________ 19 21fd30 __RU_lA_____________________________ 20 2c35ba __RU_l______________________________ 21 20f181 __RU_l______________________________ flags page-count MB symbolic-flags long-symbolic-flags 0x000000000000002c 2 0 __RU_l______________________________ referenced,uptodate,lru 0x0000000000000068 11 0 ___U_lA_____________________________ uptodate,lru,active 0x000000000000006c 4 0 __RU_lA_____________________________ referenced,uptodate,lru,active 0x000000000000086c 5 0 __RU_lA____M________________________ referenced,uptodate,lru,active,mmap total 22 0 ~/src/linux/tools/vm$ sudo ./page-types -f / flags page-count MB symbolic-flags long-symbolic-flags 0x0000000000000028 21761 85 ___U_l______________________________ uptodate,lru 0x000000000000002c 127279 497 __RU_l______________________________ referenced,uptodate,lru 0x0000000000000068 74160 289 ___U_lA_____________________________ uptodate,lru,active 0x000000000000006c 84469 329 __RU_lA_____________________________ referenced,uptodate,lru,active 0x000000000000007c 1 0 __RUDlA_____________________________ referenced,uptodate,dirty,lru,active 0x0000000000000228 370 1 ___U_l___I__________________________ uptodate,lru,reclaim 0x0000000000000828 49 0 ___U_l_____M________________________ uptodate,lru,mmap 0x000000000000082c 126 0 __RU_l_____M________________________ referenced,uptodate,lru,mmap 0x0000000000000868 137 0 ___U_lA____M________________________ uptodate,lru,active,mmap 0x000000000000086c 12890 50 __RU_lA____M________________________ referenced,uptodate,lru,active,mmap total 321242 1254 Signed-off-by: Konstantin Khlebnikov <koct9i@gmail.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Fengguang Wu <fengguang.wu@intel.com> Cc: Borislav Petkov <bp@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-12-16tools/: Convert to new topic librariesBorislav Petkov2-8/+8
Move debugfs.* to api/fs/. We have a common tools/lib/api/ place where the Makefile lives and then we place the headers in subdirs. For example, all the fs-related stuff goes to tools/lib/api/fs/ from which we get libapikfs.a (acme got almost the naming he wanted :-)) and we link it into the tools which need it - in this case perf and tools/vm/page-types. acme: "Looking at the implementation, I think some tools can even link directly to the .o files, avoiding the .a file altogether. But that is just an optimization/finer granularity tools/lib/ cherrypicking that toolers can make use of." Fixup documentation cleaning target while at it. Signed-off-by: Borislav Petkov <bp@suse.de> Acked-by: Ingo Molnar <mingo@kernel.org> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Arjan van de Ven <arjan@linux.intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Namhyung Kim <namhyung@gmail.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Pekka Enberg <penberg@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Robert Richter <rric@kernel.org> Cc: Stanislav Fomichev <stfomichev@yandex-team.ru> Cc: Stephane Eranian <eranian@google.com> Cc: Steven Rostedt <rostedt@goodmis.org> Link: http://lkml.kernel.org/r/1386605664-24041-2-git-send-email-bp@alien8.de Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2013-11-13tools/vm/page-types.c: support KPF_SOFTDIRTY bitNaoya Horiguchi1-12/+20
Soft dirty bit allows us to track which pages are written since the last clear_ref (by "echo 4 > /proc/pid/clear_refs".) This is useful for userspace applications to know their memory footprints. Note that the kernel exposes this flag via bit[55] of /proc/pid/pagemap, and the semantics is not a default one (scheduled to be the default in the near future.) However, it shifts to the new semantics at the first clear_ref, and the users of soft dirty bit always do it before utilizing the bit, so that's not a big deal. Users must avoid relying on the bit in page-types before the first clear_ref. Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: Wu Fengguang <fengguang.wu@intel.com> Cc: Pavel Emelyanov <xemul@parallels.com> Cc: Cyrill Gorcunov <gorcunov@openvz.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-03-15tools/vm: Switch to liblk libraryBorislav Petkov2-81/+21
page-flags.c had some older version of debugfs_mount copied from perf so convert it to using the version in the tools library. Signed-off-by: Borislav Petkov <bp@suse.de> Cc: Ingo Molnar <mingo@kernel.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Wu Fengguang <fengguang.wu@intel.com> Link: http://lkml.kernel.org/r/1361374353-30385-8-git-send-email-bp@alien8.de Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2013-02-05tools/vm: add .gitignore to ignore built binariesJoonsoo Kim1-0/+2
There is no .gitignore in tools/vm, so 'git status' always show built binaries. To ignore this, add .gitignore. Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-10-25UAPI: fix tools/vm/page-types.cDavid Howells1-1/+1
Fix tools/vm/page-types.c to use the UAPI variant of linux/kernel-page-flags.h lest the following error appear: In file included from page-types.c:38:0: ../../include/linux/kernel-page-flags.h:4:42: fatal error: uapi/linux/kernel-page-flags.h: No such file or directory Reported-by: Daniel Hazelton <dshadowwolf@gmail.com> Signed-off-by: David Howells <dhowells@redhat.com> Reviewed-by: Fengguang Wu <fengguang.wu@intel.com> Tested-by: Daniel Hazelton <dshadowwolf@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-10-13UAPI: (Scripted) Disintegrate include/linuxDavid Howells1-1/+1
Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Michael Kerrisk <mtk.manpages@gmail.com> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: Dave Jones <davej@redhat.com>
2012-07-02mm: Fix signal SIGFPE in slabinfo.c.majianpeng1-7/+7
In function slab_stats(), if total_free is equal zero, it will error. So fix it. Acked-by: Christoph Lameter <cl@linux.com> Signed-off-by: majianpeng <majianpeng@gmail.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
2012-05-29tools/vm/page-types.c: cleanupsUlrich Drepper1-11/+11
Compiling page-type.c with a recent compiler produces many warnings, mostly related to signed/unsigned comparisons. This patch cleans up most of them. One remaining warning is about an unused parameter. The <compiler.h> file doesn't define a __unused macro (or the like) yet. This can be addressed later. Signed-off-by: Ulrich Drepper <drepper@gmail.com> Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Acked-by: Fengguang Wu <fengguang.wu@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-05-29kbuild: install kernel-page-flags.hUlrich Drepper1-27/+1
Programs using /proc/kpageflags need to know about the various flags. The <linux/kernel-page-flags.h> provides them and the comments in the file indicate that it is supposed to be used by user-level code. But the file is not installed. Install the headers and mark the unstable flags as out-of-bounds. The page-type tool is also adjusted to not duplicate the definitions Signed-off-by: Ulrich Drepper <drepper@gmail.com> Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Acked-by: Fengguang Wu <fengguang.wu@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-03-28mm: move slabinfo.c to tools/vmDave Young2-2/+1395
We have tools/vm/ folder for vm tools, so move slabinfo.c from tools/slub/ to tools/vm/ Signed-off-by: Dave Young <dyoung@redhat.com> Cc: Wu Fengguang <fengguang.wu@intel.com> Acked-by: Christoph Lameter <cl@linux.com> Cc: Pekka Enberg <penberg@cs.helsinki.fi> Cc: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-03-28mm: move page-types.c from Documentation to tools/vmDave Young2-0/+1113
tools/ is the better place for vm tools which are used by many people. Moving them to tools also make them open to more users instead of hide in Documentation folder. This patch moves page-types.c to tools/vm/page-types.c. Also add a Makefile in tools/vm and fix two coding style problems: a) change const arrary to 'const char * const', b) change a space to tab for indent. Signed-off-by: Dave Young <dyoung@redhat.com> Acked-by: Wu Fengguang <fengguang.wu@intel.com> Cc: Christoph Lameter <cl@linux.com> Cc: Pekka Enberg <penberg@cs.helsinki.fi> Cc: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

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