linux-kernel - Re: [PATCH 5/5][RFC][CFT] resizable namespace.c hashes

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Message-ID: <87bnxi6i8w.fsf@tassilo.jf.intel.com>
Date:	Fri, 07 Mar 2014 09:17:19 -0800
From:	Andi Kleen <andi@...stfloor.org>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	linux-fsdevel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Stephen Tweedie <sct@...hat.com>,
	Jeremy Eder <jeder@...hat.com>
Subject: Re: [PATCH 5/5][RFC][CFT] resizable namespace.c hashes

Al Viro <viro@...IV.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@...ux.intel.com -- Speaking for myself only
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