tree c0cefa5b5787bb234ba8931775da2071c908e071
parent 374576a8b6f865022c0fd1ca62396889b23d66dd
author David Rientjes <rientjes@google.com> 1255598422 -0700
committer Pekka Enberg <penberg@cs.helsinki.fi> 1255631652 +0300

slub: allow stats to be cleared

When collecting slub stats for particular workloads, it's necessary to
collect each statistic for all caches before the job is even started
because the counters are usually greater than zero just from boot and
initialization.

This allows a statistic to be cleared on each cpu by writing '0' to its
sysfs file.  This creates a baseline for statistics of interest before
the workload is started.

Setting a statistic to a particular value is not supported, so all values
written to these files other than '0' returns -EINVAL.

Cc: Christoph Lameter <cl@linux-foundation.org>
Signed-off-by: David Rientjes <rientjes@google.com>
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>