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Date: Tue, 30 Oct 2001 18:06:16 +0100
From: Andrea Arcangeli <andrea@suse.de>
To: Linus Torvalds <torvalds@transmeta.com>
Cc: Hugh Dickins <hugh@veritas.com>,
        Frank Dekervel <Frank.dekervel@student.kuleuven.ac.Be>,
        Marcelo Tosatti <marcelo@conectiva.com.br>,
        linux-kernel@vger.kernel.org
Subject: Re: need help interpreting 'free' output.
Message-ID: <20011030180616.M1340@athlon.random>
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In-Reply-To: <Pine.LNX.4.33.0110300839360.8603-200000@penguin.transmeta.com>; from torvalds@transmeta.com on Tue, Oct 30, 2001 at 08:52:58AM -0800
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On Tue, Oct 30, 2001 at 08:52:58AM -0800, Linus Torvalds wrote:
> So in the short range, I haven't come up with any really good approaches,
> but I suspect I'll just have to move the shrink_[di]cache() back to the
> caller, which will at least shrink them on swapouts (a bit too much, I
> think, but on the other hand maybe not).

Agreed.

It is still interesting to hear if it makes a big performance differece
under swap though. In particular it would be very nice to keep inodes
with pagecache in it out of the unused-inode-list, but it would need
additional bitkeeping in inode.c.

I'm also wondering why you dropped the early-cow for the write swapins,
just to avoid managing the anon pages in the lru in do_swap_page and to
have the logic only in once place? I kept the early-cow logic so I only
get 1 page fault for every write-swapped-in pages.

Andrea
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