• Glauber Costa's avatar
    super: fix calculation of shrinkable objects for small numbers · 55f841ce
    Glauber Costa authored
    The sysctl knob sysctl_vfs_cache_pressure is used to determine which
    percentage of the shrinkable objects in our cache we should actively try
    to shrink.
    It works great in situations in which we have many objects (at least more
    than 100), because the aproximation errors will be negligible.  But if
    this is not the case, specially when total_objects < 100, we may end up
    concluding that we have no objects at all (total / 100 = 0, if total <
    This is certainly not the biggest killer in the world, but may matter in
    very low kernel memory situations.
    Signed-off-by: default avatarGlauber Costa <glommer@openvz.org>
    Reviewed-by: default avatarCarlos Maiolino <cmaiolino@redhat.com>
    Acked-by: default avatarKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
    Acked-by: default avatarMel Gorman <mgorman@suse.de>
    Cc: Dave Chinner <david@fromorbit.com>
    Cc: Al Viro <viro@zeniv.linux.org.uk>
    Cc: "Theodore Ts'o" <tytso@mit.edu>
    Cc: Adrian Hunter <adrian.hunter@intel.com>
    Cc: Al Viro <viro@zeniv.linux.org.uk>
    Cc: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
    Cc: Arve Hjønnevåg <arve@android.com>
    Cc: Carlos Maiolino <cmaiolino@redhat.com>
    Cc: Christoph Hellwig <hch@lst.de>
    Cc: Chuck Lever <chuck.lever@oracle.com>
    Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
    Cc: David Rientjes <rientjes@google.com>
    Cc: Gleb Natapov <gleb@redhat.com>
    Cc: Greg Thelen <gthelen@google.com>
    Cc: J. Bruce Fields <bfields@redhat.com>
    Cc: Jan Kara <jack@suse.cz>
    Cc: Jerome Glisse <jglisse@redhat.com>
    Cc: John Stultz <john.stultz@linaro.org>
    Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
    Cc: Kent Overstreet <koverstreet@google.com>
    Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
    Cc: Marcelo Tosatti <mtosatti@redhat.com>
    Cc: Mel Gorman <mgorman@suse.de>
    Cc: Steven Whitehouse <swhiteho@redhat.com>
    Cc: Thomas Hellstrom <thellstrom@vmware.com>
    Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
glock.c 52.1 KB