git: kernel - limit running io writes during fsync

[Matthew Dillon]

commit aa1bfd980e3d7a445119a5675015ac921274ace7
Author: Matthew Dillon <dillon at apollo.backplane.com>
Date:   Thu Aug 19 22:33:35 2010 -0700

    kernel - limit running io writes during fsync
    
    * The fsync code was queueing an unlimited number of BUF/BIOs while
      flushing a file, which creates a very large write burden on the
      system, read stalls due to locked buffers, and can also blow out
      things like dm_target_crypt which must allocate side-buffers for
      the data.
    
    * Fixes kmalloc exhaustion panics with dm_crypt.
    
    * Improves read performance under heavy write loads (e.g. blogbench).

Summary of changes:
 sys/kern/vfs_bio.c  |    2 +-
 sys/kern/vfs_subr.c |    1 +
 sys/sys/buf.h       |    1 +
 3 files changed, 3 insertions(+), 1 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/aa1bfd980e3d7a445119a5675015ac921274ace7


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