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From: Petr Mladek <pmladek@suse.com>
To: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: Jan Kara <jack@suse.cz>,
	Andrew Morton <akpm@linux-foundation.org>,
	Tejun Heo <tj@kernel.org>, Calvin Owens <calvinowens@fb.com>,
	linux-kernel@vger.kernel.org,
	Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
Subject: Re: [RFC][PATCH 0/7] printk: use alt_printk to handle printk() recursive calls
Date: Thu, 29 Sep 2016 15:25:02 +0200	[thread overview]
Message-ID: <20160929132502.GG26796@pathway.suse.cz> (raw)
In-Reply-To: <20160927142237.5539-1-sergey.senozhatsky@gmail.com>

On Tue 2016-09-27 23:22:30, Sergey Senozhatsky wrote:
> 	Hello,
> 
> 	RFC
> 
> 	This patch set extends a lock-less NMI per-cpu buffers idea to
> handle recursive printk() calls. The basic mechanism is pretty much the
> same -- at the beginning of a deadlock-prone section we switch to lock-less
> printk callback, and return back to a default printk implementation at the
> end; the messages are getting flushed to a logbuf buffer from a safer
> context.

I was skeptical but I really like this way now.

The switching of the buffers is a bit hairy in this version but I
think that we could make it much better.

Other than that it looks like a big win. It kills a lot of
printk-related pain points. And it will not be that complicated
after all.

Best Regards,
Petr

  parent reply	other threads:[~2016-09-29 13:25 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-09-27 14:22 [RFC][PATCH 0/7] printk: use alt_printk to handle printk() recursive calls Sergey Senozhatsky
2016-09-27 14:22 ` [RFC][PATCH 1/7] printk: use vprintk_func in vprintk() Sergey Senozhatsky
2016-09-27 14:22 ` [RFC][PATCH 2/7] printk: rename nmi.c and exported api Sergey Senozhatsky
2016-09-27 14:22 ` [RFC][PATCH 3/7] printk: introduce per-cpu alt_print seq buffer Sergey Senozhatsky
2016-09-29 12:26   ` Petr Mladek
2016-09-30  1:05     ` Sergey Senozhatsky
2016-09-30 11:35       ` Petr Mladek
2016-09-27 14:22 ` [RFC][PATCH 4/7] printk: make alt_printk available when config printk set Sergey Senozhatsky
2016-09-27 14:22 ` [RFC][PATCH 5/7] printk: drop vprintk_func function Sergey Senozhatsky
2016-09-27 14:22 ` [RFC][PATCH 6/7] printk: use alternative printk buffers Sergey Senozhatsky
2016-09-29 13:00   ` Petr Mladek
2016-09-30  1:15     ` Sergey Senozhatsky
2016-09-30 11:15       ` Petr Mladek
2016-10-01  2:48         ` Sergey Senozhatsky
2016-10-04 12:22           ` Petr Mladek
2016-10-05  1:36             ` Sergey Senozhatsky
2016-10-05 10:18               ` Petr Mladek
2016-10-03  7:53         ` Sergey Senozhatsky
2016-10-04 14:52         ` Petr Mladek
2016-10-05  1:27           ` Sergey Senozhatsky
2016-10-05  9:50             ` Petr Mladek
2016-10-06  4:22               ` Sergey Senozhatsky
2016-10-06 11:32                 ` Petr Mladek
2016-10-10  4:09                   ` Sergey Senozhatsky
2016-10-10 11:17                     ` Petr Mladek
2016-10-11  7:35                       ` Sergey Senozhatsky
2016-10-11  9:30                         ` Petr Mladek
2016-09-27 14:22 ` [RFC][PATCH 7/7] printk: new printk() recursion detection Sergey Senozhatsky
2016-09-29 13:19   ` Petr Mladek
2016-09-30  2:00     ` Sergey Senozhatsky
2016-09-29 13:25 ` Petr Mladek [this message]
2016-09-30  2:43   ` [RFC][PATCH 0/7] printk: use alt_printk to handle printk() recursive calls Sergey Senozhatsky
2016-09-30 11:27     ` Petr Mladek
2016-10-01  3:02       ` Sergey Senozhatsky
2016-10-04 11:35         ` Petr Mladek

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