OpenAFS Master Repository branch, master, updated. BP-openafs-stable-1_8_x-638-g0532f91

[Gerrit Code Review]

The following commit has been merged in the master branch:
commit 0532f917f29bdb44f4933f9c8a6c05c7fecc6bbb
Author: Andrew Deason <adeason@sinenomine.net>
Date:   Mon Jul 16 16:44:14 2018 -0500

    afs: Log warning when we detect too many vcaches
    
    Currently, afs_ShakeLooseVCaches has a kind of warning that is logged
    when we fail to free up any vcaches. This information can be useful to
    know, since it may be a sign that users are trying to access way more
    files than our configured vcache limit, hindering performance as we
    constantly try to evict and re-create vcaches for files.
    
    However, the current warning is not clear at all to non-expert users,
    and it can only occur for non-dynamic vcaches (which is uncommon these
    days).
    
    To improve this, try to make a general determination if it looks like
    the stat cache is "stressed", and log a message if so after
    afs_ShakeLooseVCaches runs (for all platforms, regardless of dynamic
    vcaches). Also try to make the message a little more user-friendly,
    and only log it (at most) once per 4 hours.
    
    Determining whether the stat cache looks stressed or not is difficult
    and arguably subjective (especially for dynamic vcaches). This commit
    draws a few arbitrary lines in the sand to make the decision, so at
    least something will be logged in the cases where users are constantly
    accessing way more files than our configured vcache limit.
    
    Change-Id: I022478dc8abb7fdef24ccc06d477b349cca759ac
    Reviewed-on: https://gerrit.openafs.org/13255
    Reviewed-by: Cheyenne Wills <cwills@sinenomine.net>
    Tested-by: BuildBot <buildbot@rampaginggeek.com>
    Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>

 src/afs/afs.h            |    2 +
 src/afs/afs_prototypes.h |    1 +
 src/afs/afs_vcache.c     |   75 +++++++++++++++++++++++++++++++++++++++++++--
 3 files changed, 74 insertions(+), 4 deletions(-)

-- 
OpenAFS Master Repository