From: Steven Rostedt <rostedt@goodmis.org>
To: Petr Mladek <pmladek@suse.com>
Cc: Vlastimil Babka <vbabka@suse.cz>,
Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>,
akpm@linux-foundation.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org,
Cong Wang <xiyou.wangcong@gmail.com>,
Dave Hansen <dave.hansen@intel.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Mel Gorman <mgorman@suse.de>, Michal Hocko <mhocko@kernel.org>,
Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
"yuwang.yuwang" <yuwang.yuwang@alibaba-inc.com>
Subject: Re: [PATCH] mm: don't warn about allocations which stall for too long
Date: Wed, 1 Nov 2017 11:36:47 -0400 [thread overview]
Message-ID: <20171101113647.243eecf8@gandalf.local.home> (raw)
In-Reply-To: <20171101133845.GF20040@pathway.suse.cz>
On Wed, 1 Nov 2017 14:38:45 +0100
Petr Mladek <pmladek@suse.com> wrote:
> This was my fear as well. Steven argued that this was theoretical.
> And I do not have a real-life bullets against this argument at
> the moment.
And my argument is still if such a situation happens, the system is so
fscked up that it should just crash.
>
> My current main worry with Steven's approach is a risk of deadlocks
> that Jan Kara saw when he played with similar solution.
And if there exists such a deadlock, then the deadlock exists today.
>
> Also I am afraid that it would add yet another twist to the console
> locking operations. It is already quite hard to follow the logic,
> see the games with:
>
> + console_locked
> + console_suspended
> + can_use_console()
> + exclusive_console
>
> And Steven is going to add:
>
> + console_owner
> + waiter
Agreed. Console_lock is just ugly. And this may just make it uglier :-/
>
> But let's wait for the patch. It might look and work nicely
> in the end.
Oh, I need to write a patch? Bah, I guess I should. Where's all those
developers dying to do kernel programing where I can pass this off to?
-- Steve
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next prev parent reply other threads:[~2017-11-01 15:36 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-26 11:28 [PATCH] mm: don't warn about allocations which stall for too long Tetsuo Handa
2017-10-26 11:41 ` Michal Hocko
2017-11-08 10:30 ` peter enderborg
2017-11-09 8:52 ` Michal Hocko
2017-11-09 9:34 ` peter enderborg
2017-11-09 10:09 ` Michal Hocko
2017-11-09 10:19 ` Tetsuo Handa
2017-10-26 14:37 ` Johannes Weiner
2017-10-31 19:32 ` Steven Rostedt
2017-11-01 8:30 ` Vlastimil Babka
2017-11-01 13:38 ` Petr Mladek
2017-11-01 15:36 ` Steven Rostedt [this message]
2017-11-02 11:46 ` Petr Mladek
2017-11-02 14:49 ` Steven Rostedt
2017-11-01 15:33 ` Steven Rostedt
2017-11-01 17:42 ` Vlastimil Babka
2017-11-01 17:54 ` Steven Rostedt
2017-11-02 8:53 ` Sergey Senozhatsky
2017-11-02 9:14 ` Sergey Senozhatsky
2017-11-02 14:55 ` Steven Rostedt
2017-11-02 12:55 ` Michal Hocko
2017-11-02 15:56 ` Steven Rostedt
2017-11-02 17:06 ` [PATCH v2] printk: Add console owner and waiter logic to load balance console writes Steven Rostedt
2017-11-02 17:10 ` Steven Rostedt
2017-11-02 17:38 ` Steven Rostedt
2017-11-03 10:19 ` Jan Kara
2017-11-03 11:18 ` Steven Rostedt
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