OpenAFS Master Repository branch, master, updated. BP-openafs-stable-1_8_x-639-g9ff45e7

[Gerrit Code Review]

The following commit has been merged in the master branch:
commit 9ff45e73cf3d91d12f09e108e1267e37ae842c87
Author: Andrew Deason <adeason@sinenomine.net>
Date:   Mon Jul 16 16:53:34 2018 -0500

    afs: Skip bulkstat if stat cache looks full
    
    Currently, afs_lookup() will try to prefetch dir entries for normal
    dirs via bulkstat whenever multiple pids are reading that dir.
    However, if we already have a lot of vcaches, ShakeLooseVCaches may be
    struggling to limit the vcaches we already have. Entering
    afs_DoBulkStat can make this worse, since we grab afs_xvcache
    repeatedly, we may kick out other vcaches, and we'll possibly create
    30 new vcaches that may not even be used before they're evicted.
    
    To try to avoid this, skip running afs_DoBulkStat if it looks like the
    stat cache is really full.
    
    Change-Id: I1634530170a189f32cb962dd7df28f88bc758b71
    Reviewed-on: https://gerrit.openafs.org/13256
    Reviewed-by: Cheyenne Wills <cwills@sinenomine.net>
    Tested-by: BuildBot <buildbot@rampaginggeek.com>
    Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>

 src/afs/VNOPS/afs_vnop_lookup.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

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