Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
From:   Uladzislau Rezki <urezki@gmail.com>
Date:   Wed, 1 Apr 2020 14:32:30 +0200
To:     Michal Hocko <mhocko@kernel.org>
Cc:     Uladzislau Rezki <urezki@gmail.com>,
        Joel Fernandes <joel@joelfernandes.org>,
        linux-kernel@vger.kernel.org, linux-mm@kvack.org,
        rcu@vger.kernel.org, willy@infradead.org, peterz@infradead.org,
        neilb@suse.com, vbabka@suse.cz, mgorman@suse.de,
        Andrew Morton <akpm@linux-foundation.org>,
        Josh Triplett <josh@joshtriplett.org>,
        Lai Jiangshan <jiangshanlai@gmail.com>,
        Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
        "Paul E. McKenney" <paulmck@kernel.org>,
        Steven Rostedt <rostedt@goodmis.org>
Subject: Re: [PATCH RFC] rcu/tree: Use GFP_MEMALLOC for alloc memory to free
 memory pattern
Message-ID: <20200401123230.GB32593@pc636>
References: <20200331131628.153118-1-joel@joelfernandes.org>
 <20200331145806.GB236678@google.com>
 <20200331153450.GM30449@dhcp22.suse.cz>
 <20200331161215.GA27676@pc636>
 <20200401070958.GB22681@dhcp22.suse.cz>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20200401070958.GB22681@dhcp22.suse.cz>
User-Agent: Mutt/1.10.1 (2018-07-13)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Wed, Apr 01, 2020 at 09:09:58AM +0200, Michal Hocko wrote:
> On Tue 31-03-20 18:12:15, Uladzislau Rezki wrote:
> > > 
> > > __GFP_ATOMIC | __GFP_HIGH is the way to get an additional access to
> > > memory reserves regarless of the sleeping status.
> > > 
> > Michal, just one question here regarding proposed flags. Can we also
> > tight it with __GFP_RETRY_MAYFAIL flag? Means it also can repeat a few
> > times in order to increase the chance of being success.
> 
> yes, __GFP_RETRY_MAYFAIL is perfectly valid with __GFP_ATOMIC. Please
> note that __GFP_ATOMIC, despite its name, doesn't imply an atomic
> allocation which cannot sleep. Quite confusing, I know. A much better
> name would be __GFP_RESERVES or something like that.
> 
OK. Then we can use GFP_ATOMIC | __GFP_RETRY_MAYFAIL to try in more harder
way.

Thanks!

--
Vlad Rezki