From: Andrea Arcangeli <andrea@suse.de>
To: riel@nl.linux.org
Cc: Ben LaHaise <bcrl@redhat.com>,
Linus Torvalds <torvalds@transmeta.com>,
linux-mm@kvack.org
Subject: Re: PG_swap_entry bug in recent kernels
Date: Tue, 4 Apr 2000 18:50:07 +0200 (CEST) [thread overview]
Message-ID: <Pine.LNX.4.21.0004041824020.921-100000@alpha.random> (raw)
In-Reply-To: <Pine.LNX.4.21.0004041230200.23401-100000@duckman.conectiva>
On Tue, 4 Apr 2000, Rik van Riel wrote:
>You might want to have read _where_ Ben's patch applies.
>
>void __delete_from_swap_cache(struct page *page)
>{
> swp_entry_t entry;
>
> entry.val = page->index;
>
>#ifdef SWAP_CACHE_INFO
> swap_cache_del_total++;
>#endif
> remove_from_swap_cache(page);
> swap_free(entry);
>+ clear_bit(PG_swap_entry, &page->flags);
>}
>
>When we remove a page from the swap cache, it seems fair to me
>that we _really_ remove it from the swap cache.
Are you sure you didn't mistaken PG_swap_entry for PG_swap_cache?
We're here talking about PG_swap_entry. The only object of that bit is to
remains set on anonymous pages that aren't in the swap cache, so next time
we'll re-add them to the swap cache we'll try to swap out them in the same
swap entry as the page were before.
>If __delete_from_swap_cache() is called from a wrong code path,
>that's something that should be fixed, of course (but that's
>orthogonal to this).
__delete_from_swap_cache is called by delete_from_swap_cache_nolock that
is called by do_swap_page that does the swapin.
>To quote from memory.c::do_swap_page() :
>
> if (write_access && !is_page_shared(page)) {
> delete_from_swap_cache_nolock(page);
> UnlockPage(page);
>
>If you think this is a bug, please fix it here...
The above quoted code is correct.
Andrea
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next prev parent reply other threads:[~2000-04-04 16:50 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-04-03 22:22 PG_swap_entry bug in recent kernels Ben LaHaise
2000-04-04 15:06 ` Andrea Arcangeli
2000-04-04 15:46 ` Rik van Riel
2000-04-04 16:50 ` Andrea Arcangeli [this message]
2000-04-04 17:06 ` Ben LaHaise
2000-04-04 18:03 ` Andrea Arcangeli
2000-04-06 22:11 ` [patch] take 2 " Ben LaHaise
2000-04-07 10:45 ` Andrea Arcangeli
2000-04-07 11:29 ` Rik van Riel
2000-04-07 12:00 ` Andrea Arcangeli
2000-04-07 12:54 ` Rik van Riel
2000-04-07 13:14 ` Andrea Arcangeli
2000-04-07 20:12 ` Kanoj Sarcar
2000-04-07 23:26 ` Andrea Arcangeli
2000-04-08 0:11 ` Kanoj Sarcar
2000-04-08 0:37 ` Kanoj Sarcar
2000-04-08 13:20 ` Andrea Arcangeli
2000-04-08 21:39 ` Kanoj Sarcar
2000-04-08 23:02 ` Andrea Arcangeli
2000-04-08 23:18 ` Kanoj Sarcar
2000-04-08 23:58 ` Andrea Arcangeli
2000-04-08 13:30 ` Andrea Arcangeli
2000-04-08 17:39 ` Andrea Arcangeli
2000-04-07 23:54 ` Andrea Arcangeli
2000-04-08 0:15 ` Kanoj Sarcar
2000-04-08 13:14 ` Andrea Arcangeli
2000-04-08 21:47 ` Kanoj Sarcar
2000-04-08 23:10 ` Andrea Arcangeli
2000-04-08 23:21 ` Kanoj Sarcar
2000-04-08 23:39 ` Andrea Arcangeli
2000-04-09 0:40 ` Kanoj Sarcar
2000-04-10 8:55 ` andrea
2000-04-11 2:45 ` Kanoj Sarcar
2000-04-11 16:22 ` Andrea Arcangeli
2000-04-11 17:40 ` Rik van Riel
2000-04-11 18:20 ` Kanoj Sarcar
2000-04-21 18:23 ` Andrea Arcangeli
2000-04-21 21:00 ` Rik van Riel
2000-04-22 1:12 ` Andrea Arcangeli
2000-04-22 1:51 ` Linus Torvalds
2000-04-22 18:29 ` Rik van Riel
2000-04-22 19:58 ` Linus Torvalds
2000-04-11 18:26 ` Kanoj Sarcar
2000-04-10 19:10 ` Stephen C. Tweedie
2000-04-08 0:04 ` Andrea Arcangeli
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