OpenAFS Master Repository branch, master, updated. BP-openafs-stable-1_8_x-631-gba8b924

[Gerrit Code Review]

The following commit has been merged in the master branch:
commit ba8b92401b8cb2f5a5306313c2702cb36cba083c
Author: Andrew Deason <adeason@sinenomine.net>
Date:   Sun Jul 8 15:00:02 2018 -0500

    afs: Bound afs_DoBulkStat dir scan
    
    Currently, afs_DoBulkStat will scan the entire directory blob, looking
    for entries to stat. If all or almost all entries are already stat'd,
    we'll scan through the entire directory, doing nontrivial work on
    each entry (we grab afs_xvcache, at least). All of this work is pretty
    pointless, since the entries are already cached and so we won't do
    anything. If many processes are trying to acquire afs_xvcache, this
    can contribute to performance issues.
    
    To avoid this, provide a constant bound on the number of entries we'll
    search through: nentries * 4. The current arbitrary limits cap
    nentries at 30, so this means we're capping the afs_DoBulkStat search
    to 120 entries.
    
    Change-Id: I66e9af5b27844ddf6cf37c8286fcc65f8e0d3f96
    Reviewed-on: https://gerrit.openafs.org/13253
    Tested-by: BuildBot <buildbot@rampaginggeek.com>
    Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>

 src/afs/VNOPS/afs_vnop_lookup.c |   16 ++++++++++++++--
 1 files changed, 14 insertions(+), 2 deletions(-)

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