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Date: Wed, 1 Nov 2017 11:36:47 -0400 From: Steven Rostedt <rostedt@...dmis.org> To: Petr Mladek <pmladek@...e.com> Cc: Vlastimil Babka <vbabka@...e.cz>, Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>, akpm@...ux-foundation.org, linux-mm@...ck.org, linux-kernel@...r.kernel.org, Cong Wang <xiyou.wangcong@...il.com>, Dave Hansen <dave.hansen@...el.com>, Johannes Weiner <hannes@...xchg.org>, Mel Gorman <mgorman@...e.de>, Michal Hocko <mhocko@...nel.org>, Sergey Senozhatsky <sergey.senozhatsky@...il.com>, "yuwang.yuwang" <yuwang.yuwang@...baba-inc.com> Subject: Re: [PATCH] mm: don't warn about allocations which stall for too long On Wed, 1 Nov 2017 14:38:45 +0100 Petr Mladek <pmladek@...e.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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