On Thu, 15 Oct 2020 16:24:15 +0200 Roger Pau Monne <roger.pau@xxxxxxxxxx> wrote: > Assume that reads and writes to the variable will be atomic. The worse > that could happen is that one of the LRU intervals is not calculated > properly if a partially written value is read, but that would only be > a transient issue. > > Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx> > --- > Cc: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> > Cc: Jens Axboe <axboe@xxxxxxxxx> > Cc: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx> > Cc: SeongJae Park <sjpark@xxxxxxxxx> > Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx > Cc: linux-block@xxxxxxxxxxxxxxx > Cc: J. Roeleveld <joost@xxxxxxxxxxxx> > Cc: Jürgen Groß <jgross@xxxxxxxx> > --- > Documentation/ABI/testing/sysfs-driver-xen-blkback | 10 ++++++++++ > drivers/block/xen-blkback/blkback.c | 9 ++++++--- > 2 files changed, 16 insertions(+), 3 deletions(-) > > diff --git a/Documentation/ABI/testing/sysfs-driver-xen-blkback b/Documentation/ABI/testing/sysfs-driver-xen-blkback > index ecb7942ff146..776f25d335ca 100644 > --- a/Documentation/ABI/testing/sysfs-driver-xen-blkback > +++ b/Documentation/ABI/testing/sysfs-driver-xen-blkback > @@ -35,3 +35,13 @@ Description: > controls the duration in milliseconds that blkback will not > cache any page not backed by a grant mapping. > The default is 10ms. > + > +What: /sys/module/xen_blkback/parameters/lru_internval > +Date: October 2020 > +KernelVersion: 5.10 > +Contact: Roger Pau Monné <roger.pau@xxxxxxxxxx> > +Description: > + The LRU mechanism to clean the lists of persistent grants needs > + to be executed periodically. This parameter controls the time > + interval between consecutive executions of the purge mechanism > + is set in ms. I think noticing the default value (100ms) here would be better. Thanks, SeongJae Park
