From: "Paul E. McKenney" <paulmck@kernel.org>
To: "Joel Fernandes (Google)" <joel@joelfernandes.org>
Cc: linux-kernel@vger.kernel.org, Davidlohr Bueso <dave@stgolabs.net>,
Josh Triplett <josh@joshtriplett.org>,
Lai Jiangshan <jiangshanlai@gmail.com>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
rcu@vger.kernel.org, Steven Rostedt <rostedt@goodmis.org>,
urezki@gmail.com
Subject: Re: [PATCH v2 rcu-dev 1/3] rcuperf: Add ability to increase object allocation size
Date: Tue, 17 Mar 2020 14:45:02 -0700 [thread overview]
Message-ID: <20200317214502.GA29184@paulmck-ThinkPad-P72> (raw)
In-Reply-To: <20200317210822.GM3199@paulmck-ThinkPad-P72>
On Tue, Mar 17, 2020 at 02:08:22PM -0700, Paul E. McKenney wrote:
> On Mon, Mar 16, 2020 at 12:32:26PM -0400, Joel Fernandes (Google) wrote:
> > This allows us to increase memory pressure dynamically using a new
> > rcuperf boot command line parameter called 'rcumult'.
> >
> > Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
>
> Applied for testing and review, thank you!
But testing did not go far:
kernel/rcu/tree.c: In function ‘kfree_rcu_shrink_count’:
kernel/rcu/tree.c:3120:16: warning: unused variable ‘flags’ [-Wunused-variable]
unsigned long flags, count = 0;
^~~~~
I will drop these and await a replacement.
Thanx, Paul
> > ---
> >
> > The Series v1->v2 only has added a new patch (3/3).
> >
> >
> > kernel/rcu/rcuperf.c | 5 ++++-
> > 1 file changed, 4 insertions(+), 1 deletion(-)
> >
> > diff --git a/kernel/rcu/rcuperf.c b/kernel/rcu/rcuperf.c
> > index a4a8d097d84d9..16dd1e6b7c09f 100644
> > --- a/kernel/rcu/rcuperf.c
> > +++ b/kernel/rcu/rcuperf.c
> > @@ -88,6 +88,7 @@ torture_param(bool, shutdown, RCUPERF_SHUTDOWN,
> > torture_param(int, verbose, 1, "Enable verbose debugging printk()s");
> > torture_param(int, writer_holdoff, 0, "Holdoff (us) between GPs, zero to disable");
> > torture_param(int, kfree_rcu_test, 0, "Do we run a kfree_rcu() perf test?");
> > +torture_param(int, kfree_mult, 1, "Multiple of kfree_obj size to allocate.");
> >
> > static char *perf_type = "rcu";
> > module_param(perf_type, charp, 0444);
> > @@ -635,7 +636,7 @@ kfree_perf_thread(void *arg)
> > }
> >
> > for (i = 0; i < kfree_alloc_num; i++) {
> > - alloc_ptr = kmalloc(sizeof(struct kfree_obj), GFP_KERNEL);
> > + alloc_ptr = kmalloc(kfree_mult * sizeof(struct kfree_obj), GFP_KERNEL);
> > if (!alloc_ptr)
> > return -ENOMEM;
> >
> > @@ -722,6 +723,8 @@ kfree_perf_init(void)
> > schedule_timeout_uninterruptible(1);
> > }
> >
> > + pr_alert("kfree object size=%lu\n", kfree_mult * sizeof(struct kfree_obj));
> > +
> > kfree_reader_tasks = kcalloc(kfree_nrealthreads, sizeof(kfree_reader_tasks[0]),
> > GFP_KERNEL);
> > if (kfree_reader_tasks == NULL) {
> > --
> > 2.25.1.481.gfbce0eb801-goog
next prev parent reply other threads:[~2020-03-17 21:45 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-16 16:32 [PATCH v2 rcu-dev 1/3] rcuperf: Add ability to increase object allocation size Joel Fernandes (Google)
2020-03-16 16:32 ` [PATCH v2 rcu-dev 2/3] rcu/tree: Add a shrinker to prevent OOM due to kfree_rcu() batching Joel Fernandes (Google)
2020-03-16 16:32 ` [PATCH v2 rcu-dev 3/3] rcu/tree: Count number of batched kfree_rcu() locklessly Joel Fernandes (Google)
2020-03-17 21:08 ` [PATCH v2 rcu-dev 1/3] rcuperf: Add ability to increase object allocation size Paul E. McKenney
2020-03-17 21:45 ` Paul E. McKenney [this message]
2020-03-17 22:30 ` Joel Fernandes
2020-03-17 22:48 ` Paul E. McKenney
2020-03-17 23:37 ` joel
2020-03-18 1:09 ` Paul E. McKenney
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