1. 17 6月, 2015 1 次提交
    • P
      mm/page_owner.c: use late_initcall to hook in enabling · 44c5af96
      Paul Gortmaker 提交于
      This was using module_init, but there is no way this code can
      be modular.  In the non-modular case, a module_init becomes a
      device_initcall, but this really isn't a device.   So we should
      choose a more appropriate initcall bucket to put it in.
      
      In order of execution, our close choices are:
      
       fs_initcall(fn)
       rootfs_initcall(fn)
       device_initcall(fn)
       late_initcall(fn)
      
      ..and since the initcall here goes after debugfs, we really
      should be post-rootfs, which means late_initcall makes the
      most sense here.
      
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: linux-mm@kvack.org
      Signed-off-by: NPaul Gortmaker <paul.gortmaker@windriver.com>
      44c5af96
  2. 12 2月, 2015 1 次提交
  3. 14 12月, 2014 2 次提交
    • J
      mm/page_owner: correct owner information for early allocated pages · 61cf5feb
      Joonsoo Kim 提交于
      Extended memory to store page owner information is initialized some time
      later than that page allocator starts.  Until initialization, many pages
      can be allocated and they have no owner information.  This make debugging
      using page owner harder, so some fixup will be helpful.
      
      This patch fixes up this situation by setting fake owner information
      immediately after page extension is initialized.  Information doesn't tell
      the right owner, but, at least, it can tell whether page is allocated or
      not, more correctly.
      
      On my testing, this patch catches 13343 early allocated pages, although
      they are mostly allocated from page extension feature.  Anyway, after
      then, there is no page left that it is allocated and has no page owner
      flag.
      Signed-off-by: NJoonsoo 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: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      61cf5feb
    • J
      mm/page_owner: keep track of page owners · 48c96a36
      Joonsoo Kim 提交于
      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: NJoonsoo 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: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      48c96a36