From: "Stephen C. Tweedie" <sct@redhat.com>
To: Shuvabrata Ganguly <sganguly@cse.iitkgp.ernet.in>
Cc: linux MM <linux-mm@kvack.org>
Subject: Re: Question about swap_in() in 2.2.16 ....
Date: Wed, 8 Nov 2000 10:05:33 +0000 [thread overview]
Message-ID: <20001108100533.C11411@redhat.com> (raw)
In-Reply-To: <3A08F37A.38C156C1@cse.iitkgp.ernet.in>; from sganguly@cse.iitkgp.ernet.in on Wed, Nov 08, 2000 at 01:32:26AM -0500
Hi,
On Wed, Nov 08, 2000 at 01:32:26AM -0500, Shuvabrata Ganguly wrote:
>
> after the missing page has been swapped in this bit of code is
> executed:-
>
> if (!write_access || is_page_shared(page_map)) {
> set_pte(page_table, mk_pte(page, vma->vm_page_prot));
> return 1;
> }
>
> Now this creates a read-only mapping even if the access was a "write
> acess" ( if the page is shared ). Doesnt this mean that an additional
> "write-protect" fault will be taken immediately when the process tries
> to write again ?
Yes.
Cheers,
Stephen
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next prev parent reply other threads:[~2000-11-08 10:05 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-11-08 6:32 Question about swap_in() in 2.2.16 Shuvabrata Ganguly
2000-11-08 10:05 ` Stephen C. Tweedie [this message]
2000-11-10 4:23 ` Shuvabrata Ganguly
2000-11-10 9:56 ` Stephen C. Tweedie
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