From: Uladzislau Rezki <urezki@gmail.com>
To: "Paul E. McKenney" <paulmck@kernel.org>,
Matthew Wilcox <willy@infradead.org>
Cc: Uladzislau Rezki <urezki@gmail.com>,
Matthew Wilcox <willy@infradead.org>,
LKML <linux-kernel@vger.kernel.org>,
linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>,
"Theodore Y . Ts'o" <tytso@mit.edu>,
Joel Fernandes <joel@joelfernandes.org>,
RCU <rcu@vger.kernel.org>,
Oleksiy Avramchenko <oleksiy.avramchenko@sonymobile.com>
Subject: Re: [PATCH v2 09/16] rcu/tree: Maintain separate array for vmalloc ptrs
Date: Thu, 18 Jun 2020 22:35:57 +0200 [thread overview]
Message-ID: <20200618203557.GB16976@pc636> (raw)
In-Reply-To: <20200618190359.GU2723@paulmck-ThinkPad-P72>
On Thu, Jun 18, 2020 at 12:03:59PM -0700, Paul E. McKenney wrote:
> On Thu, Jun 18, 2020 at 08:34:48PM +0200, Uladzislau Rezki wrote:
> > > > >
> > > > > I suspect that he would like to keep the tracing.
> > > > >
> > > > > It might be worth trying the branches, given that they would be constant
> > > > > and indexed by "i". The compiler might well remove the indirection.
> > > > >
> > > > > The compiler guys brag about doing so, which of course might or might
> > > > > not have any correlation to a given compiler actually doing so. :-/
> > > > >
> > > > > Having a vfree_bulk() might well be useful, but I would feel more
> > > > > confidence in that if there were other callers of kfree_bulk().
> > > > >
> > > > Hmm... I think replacing that with vfree_bulk() is a good idea though.
> > >
> > > In other words, get rid of kfree_bulk() in favor of vfree_bulk()?
> > >
> > kfree_bulk() does not understand vmalloc memory. vfree_bulk() should
> > be implemented to release vmalloc's pointers. On i high level it will
> > be used the same way as kfree_bulk() but for vmalloc ptrs. only.
>
> Ah, I thought that you guys were proposing something that did bulk
> free of both kmalloc and vmalloc memory.
>
I see your point. We could introduce something like:
kvfree_bulk(slab_arra, vmalloc_array);
but i do not have a strong opinion here, even though i tend to
say that it would be odd. Having just vfree_bulk(), i think
would be enough, as a result the code will look like:
<snip>
trace_rcu_invoke_kfree_bulk_callback(
rcu_state.name, bkvhead[i]->nr_records,
bkvhead[i]->records);
if (i == 0)
kfree_bulk(bkvhead[i]->nr_records,
bkvhead[i]->records);
else
vfree_bulk(bkvhead[i]->nr_records,
bkvhead[i]->records);
<snip>
Matthew, what is your thought?
Thanks!
--
Vlad rezki
next prev parent reply other threads:[~2020-06-18 20:36 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-25 21:47 [PATCH v2 00/16] Introduce kvfree_rcu(1 or 2 arguments) Uladzislau Rezki (Sony)
2020-05-25 21:47 ` [PATCH v2 01/16] rcu/tree: Keep kfree_rcu() awake during lock contention Uladzislau Rezki (Sony)
2020-05-25 21:47 ` [PATCH v2 02/16] rcu/tree: Skip entry into the page allocator for PREEMPT_RT Uladzislau Rezki (Sony)
2020-05-25 21:47 ` [PATCH v2 03/16] rcu/tree: Repeat the monitor if any free channel is busy Uladzislau Rezki (Sony)
2020-05-25 21:47 ` [PATCH v2 04/16] rcu/tree: Make debug_objects logic independent of rcu_head Uladzislau Rezki (Sony)
2020-05-25 21:47 ` [PATCH v2 05/16] rcu/tree: Simplify KFREE_BULK_MAX_ENTR macro Uladzislau Rezki (Sony)
2020-05-25 21:47 ` [PATCH v2 06/16] rcu/tree: Move kfree_rcu_cpu locking/unlocking to separate functions Uladzislau Rezki (Sony)
2020-05-25 21:47 ` [PATCH v2 07/16] rcu/tree: Use static initializer for krc.lock Uladzislau Rezki (Sony)
2020-05-25 21:47 ` [PATCH v2 08/16] rcu/tree: cache specified number of objects Uladzislau Rezki (Sony)
2020-05-25 21:47 ` [PATCH v2 09/16] rcu/tree: Maintain separate array for vmalloc ptrs Uladzislau Rezki (Sony)
2020-06-17 23:46 ` Paul E. McKenney
2020-06-18 0:52 ` Matthew Wilcox
2020-06-18 3:18 ` Paul E. McKenney
2020-06-18 17:35 ` Uladzislau Rezki
2020-06-18 17:57 ` Paul E. McKenney
2020-06-18 18:34 ` Uladzislau Rezki
2020-06-18 19:03 ` Paul E. McKenney
2020-06-18 20:35 ` Uladzislau Rezki [this message]
2020-06-18 20:38 ` Matthew Wilcox
2020-06-18 21:17 ` Uladzislau Rezki
2020-06-18 21:34 ` Paul E. McKenney
2020-06-19 15:46 ` Uladzislau Rezki
2020-06-19 16:25 ` Paul E. McKenney
2020-06-22 19:04 ` Uladzislau Rezki
2020-06-22 19:53 ` Paul E. McKenney
2020-06-30 17:46 ` Uladzislau Rezki
2020-06-18 17:30 ` Uladzislau Rezki
2020-06-18 17:35 ` Matthew Wilcox
2020-06-18 20:03 ` Uladzislau Rezki
2020-06-18 17:25 ` Uladzislau Rezki
2020-06-18 17:32 ` Paul E. McKenney
2020-06-18 17:56 ` Uladzislau Rezki
2020-06-18 18:15 ` Matthew Wilcox
2020-06-18 18:23 ` Uladzislau Rezki
2020-06-18 18:37 ` Matthew Wilcox
2020-06-18 18:48 ` Uladzislau Rezki
2020-05-25 21:47 ` [PATCH v2 10/16] rcu/tiny: support vmalloc in tiny-RCU Uladzislau Rezki (Sony)
2020-05-25 21:47 ` [PATCH v2 11/16] rcu: Rename *_kfree_callback/*_kfree_rcu_offset/kfree_call_* Uladzislau Rezki (Sony)
2020-05-25 21:47 ` [PATCH v2 12/16] mm/list_lru.c: Rename kvfree_rcu() to local variant Uladzislau Rezki (Sony)
2020-05-25 21:47 ` [PATCH v2 13/16] rcu: Introduce 2 arg kvfree_rcu() interface Uladzislau Rezki (Sony)
2020-05-25 21:47 ` [PATCH v2 14/16] rcu: Support reclaim for head-less object Uladzislau Rezki (Sony)
2020-05-25 21:47 ` [PATCH v2 15/16] rcu: Introduce single argument kvfree_rcu() interface Uladzislau Rezki (Sony)
2020-05-25 21:48 ` [PATCH v2 16/16] lib/test_vmalloc.c: Add test cases for kvfree_rcu() Uladzislau Rezki (Sony)
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