From: Bourne <bourne@ToughGuy.net>
To: linux-kernel@vger.kernel.org
Subject: 2.4.19 ( try_to_swap_out) does not set page->mapping to NULL
Date: Fri, 13 Dec 2002 08:59:26 +0530 [thread overview]
Message-ID: <3DF95416.7010107@ToughGuy.net> (raw)
Hi all, A small piece of code in mm/vmscan.c kept me confused. Please
could some one explain this ?
File: mm/vmscan.c , try_to_swap_out()
....SNIP....
drop_pte: mm->rss--
UnlockPage(page);
---SNIP--
page_cache_release(page);
return freeable;
----SNIP----
if(page->mapping)
goto drop_pte;
What i can get is if page->mapping is NOT NULL , then do a
page_cache_release(). This boils down to __free_pages_ok(). Here the
code snippet is if(page->mapping) BUG();
So if try_to_swap_out wants to drop a page which can be brought in
always ( i.e , not dirty ), then what is the harm in setting it to NULL ?
TIA
Bourne
reply other threads:[~2002-12-12 15:17 UTC|newest]
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