linux-kernel - Re: [PATCH 1/2] slub: extend slub

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Date:	Mon, 15 Aug 2011 08:55:28 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Iliyan Malchev <malchev@...gle.com>
cc:	Pekka Enberg <penberg@...nel.org>, Matt Mackall <mpm@...enic.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] slub: extend slub_debug to handle multiple slabs

On Mon, 8 Aug 2011, Iliyan Malchev wrote:

> Extend the slub_debug syntax to "slub_debug=<flags>[,<slub>]*", where <slub>
> may contain an asterisk at the end.  For example, the following would poison
> all kmalloc slabs:
>
> 	slub_debug=P,kmalloc*

The use of the star suggests that general regexps will be working. But
this is only allowing a star at the end. It is explained later. So maybe
that ok.

> +	n = slub_debug_slabs;
> +	while (*n) {
> +		int cmplen;
> +
> +		end = strchr(n, ',');
> +		if (!end)
> +			end = n + strlen(n);
> +
> +		glob = strnchr(n, end - n, '*');
> +		if (glob)
> +			cmplen = glob - n;
> +		else
> +			cmplen = max(len, end - n);
> +
> +		if (!strncmp(name, n, cmplen)) {
> +			flags |= slub_debug;
> +			break;
> +		}
> +
> +		n = *end ? end + 1 : end;

Ugg.. Confusing

How about

		if (!*end)
			break;
		n = end + 1;

or make the while loop into a for loop?
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