linux-kernel - Re: [PATCH v6 2/2] Output stall data in debugfs

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Message-ID: <1313092648.26866.3.camel@twins>
Date:	Thu, 11 Aug 2011 21:57:28 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Alex Neronskiy <zakmagnus@...omium.org>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Don Zickus <dzickus@...hat.com>,
	Mandeep Singh Baines <msb@...omium.org>,
	Alex Neronskiy <zakmagnus@...omium.com>
Subject: Re: [PATCH v6 2/2] Output stall data in debugfs

On Thu, 2011-08-11 at 12:51 -0700, Alex Neronskiy wrote:
> I didn't want to hold on to a lock while the lines were iterated over,
> and instead just dump it in one go. I guess it's not a big deal to do
> that, though. Nonetheless, is one page not enough? 

The "[<%pK>] %pS\n" that's 6bytes + 8bytes + ~64bytes making 78 bytes at
worst (assuming we have a symbol length max of 64 that is), that yields
4096/78 = 52, so yeah, just about enough since your trace depth is
limited at 50. But its close enough to make me feel uncomfortable.


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