git: kernel - vfsync() use synchronous bwrite() in low-memory situations

[Matthew Dillon]

commit aa0150ba7da7399b3e4017978cece102dd3eedbc
Author: Matthew Dillon <dillon at apollo.backplane.com>
Date:   Fri Sep 8 08:44:13 2017 -0700

    kernel - vfsync() use synchronous bwrite() in low-memory situations
    
    * For now, make vfsync() use a synchronous bwrite() in low-memory
      situations and do not call vm_wait_nominal().  This could wind up
      being a chicken-or-egg issue unfortunately.
    
    * Addresses issues where the pageout daemon gets indirectly deadlocked
      when other unrelated kernel threads (aka H2 support threads) are
      flushing buffers.

Summary of changes:
 sys/kern/vfs_subr.c | 28 ++++++++++++++++++++--------
 1 file changed, 20 insertions(+), 8 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/aa0150ba7da7399b3e4017978cece102dd3eedbc


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