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;
Date:   Wed, 4 Apr 2018 19:58:41 -0700
From:   Matthew Wilcox <willy@infradead.org>
To:     Steven Rostedt <rostedt@goodmis.org>
Cc:     Michal Hocko <mhocko@kernel.org>,
        Zhaoyang Huang <huangzhaoyang@gmail.com>,
        Ingo Molnar <mingo@kernel.org>, linux-kernel@vger.kernel.org,
        kernel-patch-test@lists.linaro.org,
        Andrew Morton <akpm@linux-foundation.org>,
        Joel Fernandes <joelaf@google.com>, linux-mm@kvack.org,
        Vlastimil Babka <vbabka@suse.cz>
Subject: Re: [PATCH v1] kernel/trace:check the val against the available mem
Message-ID: <20180405025841.GA9301@bombadil.infradead.org>
References: <20180403121614.GV5501@dhcp22.suse.cz>
 <20180403082348.28cd3c1c@gandalf.local.home>
 <20180403123514.GX5501@dhcp22.suse.cz>
 <20180403093245.43e7e77c@gandalf.local.home>
 <20180403135607.GC5501@dhcp22.suse.cz>
 <CAGWkznH-yfAu=fMo1YWU9zo-DomHY8YP=rw447rUTgzvVH4RpQ@mail.gmail.com>
 <20180404062340.GD6312@dhcp22.suse.cz>
 <20180404101149.08f6f881@gandalf.local.home>
 <20180404142329.GI6312@dhcp22.suse.cz>
 <20180404114730.65118279@gandalf.local.home>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20180404114730.65118279@gandalf.local.home>
User-Agent: Mutt/1.9.2 (2017-12-15)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Wed, Apr 04, 2018 at 11:47:30AM -0400, Steven Rostedt wrote:
> I originally was going to remove the RETRY_MAYFAIL, but adding this
> check (at the end of the loop though) appears to have OOM consistently
> kill this task.
> 
> I still like to keep RETRY_MAYFAIL, because it wont trigger OOM if
> nothing comes in and tries to do an allocation, but instead will fail
> nicely with -ENOMEM.

I still don't get why you want RETRY_MAYFAIL.  You know that tries
*harder* to allocate memory than plain GFP_KERNEL does, right?  And
that seems like the exact opposite of what you want.