From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andi Kleen <andi@firstfloor.org>
Subject: Re: [PATCH 5/5][RFC][CFT] resizable namespace.c hashes
Date: Fri, 07 Mar 2014 09:17:19 -0800
Message-ID: <87bnxi6i8w.fsf@tassilo.jf.intel.com>
References: <20140305034751.GW18016@ZenIV.linux.org.uk>
	<20140305035219.GE26528@ZenIV.linux.org.uk>
Mime-Version: 1.0
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Cc: linux-fsdevel@vger.kernel.org,
	Linus Torvalds <torvalds@linux-foundation.org>,
	linux-kernel@vger.kernel.org, Stephen Tweedie <sct@redhat.com>,
	Jeremy Eder <jeder@redhat.com>
To: Al Viro <viro@ZenIV.linux.org.uk>
Return-path: <linux-kernel-owner@vger.kernel.org>
In-Reply-To: <20140305035219.GE26528@ZenIV.linux.org.uk> (Al Viro's message of
	"Wed, 5 Mar 2014 03:52:19 +0000")
Sender: linux-kernel-owner@vger.kernel.org
List-Id: linux-fsdevel.vger.kernel.org

Al Viro <viro@ZenIV.linux.org.uk> writes:

> * switch allocation to alloc_large_system_hash()
> * make sizes overridable by boot parameters (mhash_entries=, mphash_entries=)
> * switch mountpoint_hashtable from list_head to hlist_head

So how much memory does this use on a standard system (<4GB memory)?
How much memory does it use on a large system (0.5TB)?

How good is your hash function. Would jhash be more appropiate
and allow smaller hash tables?

Perhaps just want a tree here.

-Andi

-- 
ak@linux.intel.com -- Speaking for myself only