linux-kernel - Re: [PATCH -tip 3/3] kprobes: cleanup: use list instead of hlist for insn

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Date:	Tue, 30 Jun 2009 23:25:12 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Masami Hiramatsu <mhiramat@...hat.com>
Cc:	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	lkml <linux-kernel@...r.kernel.org>,
	systemtap <systemtap@...rces.redhat.com>,
	DLE <dle-develop@...ts.sourceforge.net>,
	Jim Keniston <jkenisto@...ibm.com>
Subject: Re: [PATCH -tip 3/3] kprobes: cleanup: use list instead of hlist
	for insn_pages


* Masami Hiramatsu <mhiramat@...hat.com> wrote:

> Use struct list instead of struct hlist for managing insn_pages, 
> because insn_pages doesn't use hash table.

>  struct kprobe_insn_page {
> -	struct hlist_node hlist;
> +	struct list_head list;

Hm, you know that this increases the size of kprobe_insn_page by 4/8 
bytes, right?

hlists are not just used for hashes - but also when we want a more 
compact / smaller list head.

How many kprobe_insn_page's can be allocated in the system, 
maximally?

	Ingo
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