linux-kernel - Re: [PATCH v7 net-next 1/3] filter: add Extended BPF interpreter and converter

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Message-ID: <1394376353.20149.96.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Sun, 09 Mar 2014 07:45:53 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Alexei Starovoitov <ast@...mgrid.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Daniel Borkmann <dborkman@...hat.com>,
	Ingo Molnar <mingo@...nel.org>, Will Drewry <wad@...omium.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	"H. Peter Anvin" <hpa@...or.com>,
	Hagen Paul Pfeifer <hagen@...u.net>,
	Jesse Gross <jesse@...ira.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Tom Zanussi <tom.zanussi@...ux.intel.com>,
	Jovi Zhangwei <jovi.zhangwei@...il.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Pekka Enberg <penberg@....fi>,
	Arjan van de Ven <arjan@...radead.org>,
	Christoph Hellwig <hch@...radead.org>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH v7 net-next 1/3] filter: add Extended BPF interpreter
 and converter

On Sat, 2014-03-08 at 15:15 -0800, Alexei Starovoitov wrote:

> +/**
> + *	sk_run_filter_ext - run an extended filter
> + *	@ctx: buffer to run the filter on
> + *	@insn: filter to apply
> + *
> + * Decode and execute extended BPF instructions.
> + * @ctx is the data we are operating on.
> + * @filter is the array of filter instructions.
> + */
> +notrace u32 sk_run_filter_ext(void *ctx, const struct sock_filter_ext *insn)
> +{
> +	u64 stack[64];
> +	u64 regs[16];
> +	void *ptr;
> +	u64 tmp;
> +	int off;

Why is this 'notrace' ?

80 u64 on the stack, that is 640 bytes to run a filter ????


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