1. 22 Jan, 2013 1 commit
    • Namjae Jeon's avatar
      udf: add extent cache support in case of file reading · 99600051
      Namjae Jeon authored
      This patch implements extent caching in case of file reading.
      While reading a file, currently, UDF reads metadata serially
      which takes a lot of time depending on the number of extents present
      in the file. Caching last accessd extent improves metadata read time.
      Instead of reading file metadata from start, now we read from
      the cached extent.
      
      This patch considerably improves the time spent by CPU in kernel mode.
      For example, while reading a 10.9 GB file using dd:
      Time before applying patch:
      11677022208 bytes (10.9GB) copied, 1529.748921 seconds, 7.3MB/s
      real    25m 29.85s
      user    0m 12.41s
      sys     15m 34.75s
      
      Time after applying patch:
      11677022208 bytes (10.9GB) copied, 1469.338231 seconds, 7.6MB/s
      real    24m 29.44s
      user    0m 15.73s
      sys     3m 27.61s
      
      [JK: Fix bh refcounting issues, simplify initialization]
      Signed-off-by: default avatarNamjae Jeon <namjae.jeon@samsung.com>
      Signed-off-by: default avatarAshish Sangwan <a.sangwan@samsung.com>
      Signed-off-by: default avatarBonggil Bak <bgbak@samsung.com>
      Signed-off-by: default avatarJan Kara <jack@suse.cz>
      99600051
  2. 29 Feb, 2012 1 commit
  3. 06 Jan, 2011 1 commit
  4. 02 Apr, 2009 1 commit
  5. 17 Apr, 2008 2 commits
  6. 08 Feb, 2008 1 commit
  7. 22 Jul, 2007 1 commit
  8. 19 Jul, 2007 1 commit
  9. 16 Apr, 2005 1 commit
    • Linus Torvalds's avatar
      Linux-2.6.12-rc2 · 1da177e4
      Linus Torvalds authored
      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