1. 04 3月, 2013 1 次提交
  2. 27 9月, 2012 2 次提交
  3. 30 5月, 2012 1 次提交
  4. 31 10月, 2011 1 次提交
  5. 25 5月, 2011 1 次提交
  6. 10 3月, 2011 2 次提交
  7. 25 5月, 2010 1 次提交
  8. 07 4月, 2010 1 次提交
  9. 30 3月, 2010 1 次提交
    • T
      include cleanup: Update gfp.h and slab.h includes to prepare for breaking... · 5a0e3ad6
      Tejun Heo 提交于
      include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
      
      percpu.h is included by sched.h and module.h and thus ends up being
      included when building most .c files.  percpu.h includes slab.h which
      in turn includes gfp.h making everything defined by the two files
      universally available and complicating inclusion dependencies.
      
      percpu.h -> slab.h dependency is about to be removed.  Prepare for
      this change by updating users of gfp and slab facilities include those
      headers directly instead of assuming availability.  As this conversion
      needs to touch large number of source files, the following script is
      used as the basis of conversion.
      
        http://userweb.kernel.org/~tj/misc/slabh-sweep.py
      
      The script does the followings.
      
      * Scan files for gfp and slab usages and update includes such that
        only the necessary includes are there.  ie. if only gfp is used,
        gfp.h, if slab is used, slab.h.
      
      * When the script inserts a new include, it looks at the include
        blocks and try to put the new include such that its order conforms
        to its surrounding.  It's put in the include block which contains
        core kernel includes, in the same order that the rest are ordered -
        alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
        doesn't seem to be any matching order.
      
      * If the script can't find a place to put a new include (mostly
        because the file doesn't have fitting include block), it prints out
        an error message indicating which .h file needs to be added to the
        file.
      
      The conversion was done in the following steps.
      
      1. The initial automatic conversion of all .c files updated slightly
         over 4000 files, deleting around 700 includes and adding ~480 gfp.h
         and ~3000 slab.h inclusions.  The script emitted errors for ~400
         files.
      
      2. Each error was manually checked.  Some didn't need the inclusion,
         some needed manual addition while adding it to implementation .h or
         embedding .c file was more appropriate for others.  This step added
         inclusions to around 150 files.
      
      3. The script was run again and the output was compared to the edits
         from #2 to make sure no file was left behind.
      
      4. Several build tests were done and a couple of problems were fixed.
         e.g. lib/decompress_*.c used malloc/free() wrappers around slab
         APIs requiring slab.h to be added manually.
      
      5. The script was run on all .h files but without automatically
         editing them as sprinkling gfp.h and slab.h inclusions around .h
         files could easily lead to inclusion dependency hell.  Most gfp.h
         inclusion directives were ignored as stuff from gfp.h was usually
         wildly available and often used in preprocessor macros.  Each
         slab.h inclusion directive was examined and added manually as
         necessary.
      
      6. percpu.h was updated not to include slab.h.
      
      7. Build test were done on the following configurations and failures
         were fixed.  CONFIG_GCOV_KERNEL was turned off for all tests (as my
         distributed build env didn't work with gcov compiles) and a few
         more options had to be turned off depending on archs to make things
         build (like ipr on powerpc/64 which failed due to missing writeq).
      
         * x86 and x86_64 UP and SMP allmodconfig and a custom test config.
         * powerpc and powerpc64 SMP allmodconfig
         * sparc and sparc64 SMP allmodconfig
         * ia64 SMP allmodconfig
         * s390 SMP allmodconfig
         * alpha SMP allmodconfig
         * um on x86_64 SMP allmodconfig
      
      8. percpu.h modifications were reverted so that it could be applied as
         a separate patch and serve as bisection point.
      
      Given the fact that I had only a couple of failures from tests on step
      6, I'm fairly confident about the coverage of this conversion patch.
      If there is a breakage, it's likely to be something in one of the arch
      headers which should be easily discoverable easily on most builds of
      the specific arch.
      Signed-off-by: NTejun Heo <tj@kernel.org>
      Guess-its-ok-by: NChristoph Lameter <cl@linux-foundation.org>
      Cc: Ingo Molnar <mingo@redhat.com>
      Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
      5a0e3ad6
  10. 07 3月, 2010 1 次提交
    • W
      readahead: introduce FMODE_RANDOM for POSIX_FADV_RANDOM · 0141450f
      Wu Fengguang 提交于
      This fixes inefficient page-by-page reads on POSIX_FADV_RANDOM.
      
      POSIX_FADV_RANDOM used to set ra_pages=0, which leads to poor performance:
      a 16K read will be carried out in 4 _sync_ 1-page reads.
      
      In other places, ra_pages==0 means
      - it's ramfs/tmpfs/hugetlbfs/sysfs/configfs
      - some IO error happened
      where multi-page read IO won't help or should be avoided.
      
      POSIX_FADV_RANDOM actually want a different semantics: to disable the
      *heuristic* readahead algorithm, and to use a dumb one which faithfully
      submit read IO for whatever application requests.
      
      So introduce a flag FMODE_RANDOM for POSIX_FADV_RANDOM.
      
      Note that the random hint is not likely to help random reads performance
      noticeably.  And it may be too permissive on huge request size (its IO
      size is not limited by read_ahead_kb).
      
      In Quentin's report (http://lkml.org/lkml/2009/12/24/145), the overall
      (NFS read) performance of the application increased by 313%!
      Tested-by: NQuentin Barnes <qbarnes+nfs@yahoo-inc.com>
      Signed-off-by: NWu Fengguang <fengguang.wu@intel.com>
      Cc: Nick Piggin <npiggin@suse.de>
      Cc: Andi Kleen <andi@firstfloor.org>
      Cc: Steven Whitehouse <swhiteho@redhat.com>
      Cc: David Howells <dhowells@redhat.com>
      Cc: Jonathan Corbet <corbet@lwn.net>
      Cc: Al Viro <viro@zeniv.linux.org.uk>
      Cc: Christoph Hellwig <hch@infradead.org>
      Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
      Cc: Chuck Lever <chuck.lever@oracle.com>
      Cc: <stable@kernel.org>			[2.6.33.x]
      Cc: <qbarnes+nfs@yahoo-inc.com>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      0141450f
  11. 18 12月, 2009 1 次提交
    • H
      readahead: add blk_run_backing_dev · 65a80b4c
      Hisashi Hifumi 提交于
      I added blk_run_backing_dev on page_cache_async_readahead so readahead I/O
      is unpluged to improve throughput on especially RAID environment.
      
      The normal case is, if page N become uptodate at time T(N), then T(N) <=
      T(N+1) holds.  With RAID (and NFS to some degree), there is no strict
      ordering, the data arrival time depends on runtime status of individual
      disks, which breaks that formula.  So in do_generic_file_read(), just
      after submitting the async readahead IO request, the current page may well
      be uptodate, so the page won't be locked, and the block device won't be
      implicitly unplugged:
      
                     if (PageReadahead(page))
                              page_cache_async_readahead()
                      if (!PageUptodate(page))
                                      goto page_not_up_to_date;
                      //...
      page_not_up_to_date:
                      lock_page_killable(page);
      
      Therefore explicit unplugging can help.
      
      Following is the test result with dd.
      
      #dd if=testdir/testfile of=/dev/null bs=16384
      
      -2.6.30-rc6
      1048576+0 records in
      1048576+0 records out
      17179869184 bytes (17 GB) copied, 224.182 seconds, 76.6 MB/s
      
      -2.6.30-rc6-patched
      1048576+0 records in
      1048576+0 records out
      17179869184 bytes (17 GB) copied, 206.465 seconds, 83.2 MB/s
      
      (7Disks RAID-0 Array)
      
      -2.6.30-rc6
      1054976+0 records in
      1054976+0 records out
      17284726784 bytes (17 GB) copied, 212.233 seconds, 81.4 MB/s
      
      -2.6.30-rc6-patched
      1054976+0 records out
      17284726784 bytes (17 GB) copied, 198.878 seconds, 86.9 MB/s
      
      (7Disks RAID-5 Array)
      
      The patch was found to improve performance with the SCST scsi target
      driver.  See
      http://sourceforge.net/mailarchive/forum.php?thread_name=a0272b440906030714g67eabc5k8f847fb1e538cc62%40mail.gmail.com&forum_name=scst-devel
      
      [akpm@linux-foundation.org: unbust comment layout]
      [akpm@linux-foundation.org: "fix" CONFIG_BLOCK=n]
      Signed-off-by: NHisashi Hifumi <hifumi.hisashi@oss.ntt.co.jp>
      Acked-by: NWu Fengguang <fengguang.wu@intel.com>
      Cc: Jens Axboe <jens.axboe@oracle.com>
      Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
      Tested-by: NRonald <intercommit@gmail.com>
      Cc: Bart Van Assche <bart.vanassche@gmail.com>
      Cc: Vladislav Bolkhovitin <vst@vlnb.net>
      Cc: Randy Dunlap <randy.dunlap@oracle.com>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      65a80b4c
  12. 17 6月, 2009 8 次提交
  13. 03 4月, 2009 2 次提交
  14. 26 3月, 2009 1 次提交
  15. 20 10月, 2008 1 次提交
    • R
      vmscan: split LRU lists into anon & file sets · 4f98a2fe
      Rik van Riel 提交于
      Split the LRU lists in two, one set for pages that are backed by real file
      systems ("file") and one for pages that are backed by memory and swap
      ("anon").  The latter includes tmpfs.
      
      The advantage of doing this is that the VM will not have to scan over lots
      of anonymous pages (which we generally do not want to swap out), just to
      find the page cache pages that it should evict.
      
      This patch has the infrastructure and a basic policy to balance how much
      we scan the anon lists and how much we scan the file lists.  The big
      policy changes are in separate patches.
      
      [lee.schermerhorn@hp.com: collect lru meminfo statistics from correct offset]
      [kosaki.motohiro@jp.fujitsu.com: prevent incorrect oom under split_lru]
      [kosaki.motohiro@jp.fujitsu.com: fix pagevec_move_tail() doesn't treat unevictable page]
      [hugh@veritas.com: memcg swapbacked pages active]
      [hugh@veritas.com: splitlru: BDI_CAP_SWAP_BACKED]
      [akpm@linux-foundation.org: fix /proc/vmstat units]
      [nishimura@mxp.nes.nec.co.jp: memcg: fix handling of shmem migration]
      [kosaki.motohiro@jp.fujitsu.com: adjust Quicklists field of /proc/meminfo]
      [kosaki.motohiro@jp.fujitsu.com: fix style issue of get_scan_ratio()]
      Signed-off-by: NRik van Riel <riel@redhat.com>
      Signed-off-by: NLee Schermerhorn <Lee.Schermerhorn@hp.com>
      Signed-off-by: NKOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
      Signed-off-by: NHugh Dickins <hugh@veritas.com>
      Signed-off-by: NDaisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      4f98a2fe
  16. 17 10月, 2008 1 次提交
  17. 27 7月, 2008 1 次提交
  18. 30 4月, 2008 1 次提交
  19. 20 3月, 2008 1 次提交
  20. 17 10月, 2007 7 次提交
  21. 10 10月, 2007 1 次提交
  22. 20 7月, 2007 3 次提交