linux-kernel - Re: [PATCH] lazy freeing of memory through MADV

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Message-ID: <17965.35482.107374.228339@cargo.ozlabs.ibm.com>
Date:	Tue, 24 Apr 2007 14:42:02 +1000
From:	Paul Mackerras <paulus@...ba.org>
To:	Rik van Riel <riel@...hat.com>
Cc:	Nick Piggin <nickpiggin@...oo.com.au>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>, shak <dshaks@...hat.com>,
	jakub@...hat.com, drepper@...hat.com
Subject: Re: [PATCH] lazy freeing of memory through MADV_FREE

Rik van Riel writes:

> I guess we'll need to call tlb_remove_tlb_entry() inside the
> MADV_FREE code to keep powerpc happy.

I don't see why; once ptep_test_and_clear_young has returned, the
entry in the hash table has already been removed.  Adding the
tlb_remove_tlb_entry call certainly won't do anything on 64-bit
powerpc, since it expands to do {} while (0) there, and in fact it
won't do anything on 32-bit powerpc either.

Paul.
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