Messages in this thread | | | Date | Mon, 3 Jun 2013 15:39:31 -0700 | From | Tejun Heo <> | Subject | Re: [PATCH] Generic percpu refcounting |
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On Fri, May 31, 2013 at 03:26:45PM -0700, Kent Overstreet wrote: > This implements a refcount with similar semantics to > atomic_get()/atomic_dec_and_test() - but percpu. > > It also implements two stage shutdown, as we need it to tear down the > percpu counts. Before dropping the initial refcount, you must call > percpu_ref_kill(); this puts the refcount in "shutting down mode" and > switches back to a single atomic refcount with the appropriate barriers > (synchronize_rcu()). > > It's also legal to call percpu_ref_kill() multiple times - it only returns > true once, so callers don't have to reimplement shutdown synchronization. > > [akpm@linux-foundation.org: fix build] > [akpm@linux-foundation.org: coding-style tweak] > Signed-off-by: Kent Overstreet <koverstreet@google.com> > Cc: Zach Brown <zab@redhat.com> > Cc: Felipe Balbi <balbi@ti.com> > Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> > Cc: Mark Fasheh <mfasheh@suse.com> > Cc: Joel Becker <jlbec@evilplan.org> > Cc: Rusty Russell <rusty@rustcorp.com.au> > Cc: Jens Axboe <axboe@kernel.dk> > Cc: Asai Thambi S P <asamymuthupa@micron.com> > Cc: Selvan Mani <smani@micron.com> > Cc: Sam Bradshaw <sbradshaw@micron.com> > Cc: Jeff Moyer <jmoyer@redhat.com> > Cc: Al Viro <viro@zeniv.linux.org.uk> > Cc: Benjamin LaHaise <bcrl@kvack.org> > Cc: Tejun Heo <tj@kernel.org> > Cc: Oleg Nesterov <oleg@redhat.com> > Cc: Christoph Lameter <cl@linux-foundation.org> > Cc: Ingo Molnar <mingo@redhat.com> > Reviewed-by: "Theodore Ts'o" <tytso@mit.edu> > Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Applied to percpu/for-3.11. Andrew, I removed your SOB as the patch is routed outside -mm. Please let me know if you want reviewed/ackd-by added.
git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu.git for-3.11
Thanks a lot!
-- tejun
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