From: "Stephen C. Tweedie" <sct@redhat.com>
To: Neil Schemenauer <nascheme@enme.ucalgary.ca>
Cc: Kanoj Sarcar <kanoj@google.engr.sgi.com>, linux-mm@kvack.org
Subject: Re: shrink_mmap bug in 2.2?
Date: Fri, 16 Jun 2000 11:05:02 +0100 [thread overview]
Message-ID: <20000616110502.A1202@redhat.com> (raw)
In-Reply-To: <20000615131241.D9717@acs.ucalgary.ca>; from nascheme@enme.ucalgary.ca on Thu, Jun 15, 2000 at 01:12:41PM -0600
Hi,
On Thu, Jun 15, 2000 at 01:12:41PM -0600, Neil Schemenauer wrote:
>
> If the page is not referenced it will be removed regardless of
> the swap_count. My question is "does swap_count have to equal
> one before calling delete_from_swap_cache"? If it does then I
> think the code is wrong.
No. The swap cache is only an in-memory cached copy of the on-disk
swap page. It is quite safe to delete the swap cache page in memory
no matter how many references to the on-disk copy there are. If
this were not true, we'd be unable to delete any swapped-out pages
from ram!
Cheers,
Stephen
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prev parent reply other threads:[~2000-06-16 10:05 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-06-15 0:50 shrink_mmap bug in 2.2? Neil Schemenauer
2000-06-15 1:16 ` Kanoj Sarcar
2000-06-15 8:58 ` volodya
2000-06-15 16:56 ` Kanoj Sarcar
2000-06-15 19:12 ` Neil Schemenauer
2000-06-16 10:05 ` Stephen C. Tweedie [this message]
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