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Re: [Fwd: [patch #2508] ext2fs support for large store (> 1.5G)]

From: Ognyan Kulev
Subject: Re: [Fwd: [patch #2508] ext2fs support for large store (> 1.5G)]
Date: Wed, 25 Feb 2004 21:03:44 +0200
User-agent: Mozilla Thunderbird 0.5 (X11/20040221)

Marco Gerards wrote:
Right, I forgot about the pokels.  But I missed the rationale behind
flushing _all_ the pages with ref. count zero.  I understand why it
has to be zero, I just do not understand why you have to flush all
instead of just a few.

Perhaps I just read over the text, can you please point me to it?

I meant this (about peeking all pages because of the Mach bug):

"It's true that with large disk
cache, e.g. 512M, this potentially will re-read the whole cache from
disk.  But if we reach this point, the microkernel is telling us that
all is already read :-)"

Obviously this is not directly related to your questions (why not flush just some pages, not all), so there is no "rationale" behind this case.

Now I agree that flushing just some pages is always better idea.


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