linux-kernel - Re: [PATCHv7 6/8] printk: use printk

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Message-ID: <20170201114150.66b2e238@gandalf.local.home>
Date:   Wed, 1 Feb 2017 11:41:50 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Petr Mladek <pmladek@...e.com>, Jan Kara <jack@...e.cz>,
        Ross Zwisler <zwisler@...il.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Ross Zwisler <ross.zwisler@...ux.intel.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Tejun Heo <tj@...nel.org>, Calvin Owens <calvinowens@...com>,
        Ingo Molnar <mingo@...hat.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Hurley <peter@...leysoftware.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Subject: Re: [PATCHv7 6/8] printk: use printk_safe buffers in printk

On Wed, 1 Feb 2017 17:15:41 +0100
Peter Zijlstra <peterz@...radead.org> wrote:
 
> So my kernel doesn't yet have that abomination; that redirects it to a
> buffer for later printing right? I hope that buffer is big enough to
> hold a full WARN splat and the machine lives long enough to make it to
> printing that crap.


By default the buffer is 8K (minus 3 * sizeof(long)). But there's a
config option to grow it up to 128K if you like.

-- Steve