1. 14 7月, 2007 1 次提交
    • D
      [XFS] Concurrent Multi-File Data Streams · 2a82b8be
      David Chinner 提交于
      In media spaces, video is often stored in a frame-per-file format. When
      dealing with uncompressed realtime HD video streams in this format, it is
      crucial that files do not get fragmented and that multiple files a placed
      contiguously on disk.
      
      When multiple streams are being ingested and played out at the same time,
      it is critical that the filesystem does not cross the streams and
      interleave them together as this creates seek and readahead cache miss
      latency and prevents both ingest and playout from meeting frame rate
      targets.
      
      This patch set creates a "stream of files" concept into the allocator to
      place all the data from a single stream contiguously on disk so that RAID
      array readahead can be used effectively. Each additional stream gets
      placed in different allocation groups within the filesystem, thereby
      ensuring that we don't cross any streams. When an AG fills up, we select a
      new AG for the stream that is not in use.
      
      The core of the functionality is the stream tracking - each inode that we
      create in a directory needs to be associated with the directories' stream.
      Hence every time we create a file, we look up the directories' stream
      object and associate the new file with that object.
      
      Once we have a stream object for a file, we use the AG that the stream
      object point to for allocations. If we can't allocate in that AG (e.g. it
      is full) we move the entire stream to another AG. Other inodes in the same
      stream are moved to the new AG on their next allocation (i.e. lazy
      update).
      
      Stream objects are kept in a cache and hold a reference on the inode.
      Hence the inode cannot be reclaimed while there is an outstanding stream
      reference. This means that on unlink we need to remove the stream
      association and we also need to flush all the associations on certain
      events that want to reclaim all unreferenced inodes (e.g. filesystem
      freeze).
      
      SGI-PV: 964469
      SGI-Modid: xfs-linux-melb:xfs-kern:29096a
      Signed-off-by: NDavid Chinner <dgc@sgi.com>
      Signed-off-by: NBarry Naujok <bnaujok@sgi.com>
      Signed-off-by: NDonald Douwsma <donaldd@sgi.com>
      Signed-off-by: NChristoph Hellwig <hch@infradead.org>
      Signed-off-by: NTim Shimmin <tes@sgi.com>
      Signed-off-by: NVlad Apostolov <vapo@sgi.com>
      2a82b8be
  2. 15 2月, 2007 1 次提交
    • E
      [PATCH] sysctl: remove insert_at_head from register_sysctl · 0b4d4147
      Eric W. Biederman 提交于
      The semantic effect of insert_at_head is that it would allow new registered
      sysctl entries to override existing sysctl entries of the same name.  Which is
      pain for caching and the proc interface never implemented.
      
      I have done an audit and discovered that none of the current users of
      register_sysctl care as (excpet for directories) they do not register
      duplicate sysctl entries.
      
      So this patch simply removes the support for overriding existing entries in
      the sys_sysctl interface since no one uses it or cares and it makes future
      enhancments harder.
      Signed-off-by: NEric W. Biederman <ebiederm@xmission.com>
      Acked-by: NRalf Baechle <ralf@linux-mips.org>
      Acked-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
      Cc: Russell King <rmk@arm.linux.org.uk>
      Cc: David Howells <dhowells@redhat.com>
      Cc: "Luck, Tony" <tony.luck@intel.com>
      Cc: Ralf Baechle <ralf@linux-mips.org>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
      Cc: Andi Kleen <ak@muc.de>
      Cc: Jens Axboe <axboe@kernel.dk>
      Cc: Corey Minyard <minyard@acm.org>
      Cc: Neil Brown <neilb@suse.de>
      Cc: "John W. Linville" <linville@tuxdriver.com>
      Cc: James Bottomley <James.Bottomley@steeleye.com>
      Cc: Jan Kara <jack@ucw.cz>
      Cc: Trond Myklebust <trond.myklebust@fys.uio.no>
      Cc: Mark Fasheh <mark.fasheh@oracle.com>
      Cc: David Chinner <dgc@sgi.com>
      Cc: "David S. Miller" <davem@davemloft.net>
      Cc: Patrick McHardy <kaber@trash.net>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      0b4d4147
  3. 10 2月, 2007 2 次提交
  4. 23 6月, 2006 1 次提交
  5. 09 6月, 2006 1 次提交
  6. 23 3月, 2006 1 次提交
    • A
      [PATCH] more for_each_cpu() conversions · 394e3902
      Andrew Morton 提交于
      When we stop allocating percpu memory for not-possible CPUs we must not touch
      the percpu data for not-possible CPUs at all.  The correct way of doing this
      is to test cpu_possible() or to use for_each_cpu().
      
      This patch is a kernel-wide sweep of all instances of NR_CPUS.  I found very
      few instances of this bug, if any.  But the patch converts lots of open-coded
      test to use the preferred helper macros.
      
      Cc: Mikael Starvik <starvik@axis.com>
      Cc: David Howells <dhowells@redhat.com>
      Acked-by: NKyle McMartin <kyle@parisc-linux.org>
      Cc: Anton Blanchard <anton@samba.org>
      Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
      Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
      Cc: Paul Mundt <lethal@linux-sh.org>
      Cc: "David S. Miller" <davem@davemloft.net>
      Cc: William Lee Irwin III <wli@holomorphy.com>
      Cc: Andi Kleen <ak@muc.de>
      Cc: Christian Zankel <chris@zankel.net>
      Cc: Philippe Elie <phil.el@wanadoo.fr>
      Cc: Nathan Scott <nathans@sgi.com>
      Cc: Jens Axboe <axboe@suse.de>
      Cc: Eric Dumazet <dada1@cosmosbay.com>
      Signed-off-by: NAndrew Morton <akpm@osdl.org>
      Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      394e3902
  7. 02 11月, 2005 2 次提交
  8. 17 4月, 2005 1 次提交
    • L
      Linux-2.6.12-rc2 · 1da177e4
      Linus Torvalds 提交于
      Initial git repository build. I'm not bothering with the full history,
      even though we have it. We can create a separate "historical" git
      archive of that later if we want to, and in the meantime it's about
      3.2GB when imported into git - space that would just make the early
      git days unnecessarily complicated, when we don't have a lot of good
      infrastructure for it.
      
      Let it rip!
      1da177e4