From: Matthew Wilcox <willy@infradead.org>
To: jeff.xie@linux.dev
Cc: akpm@linux-foundation.org, iamjoonsoo.kim@lge.com,
vbabka@suse.cz, cl@linux.com, penberg@kernel.org,
rientjes@google.com, roman.gushchin@linux.dev,
42.hyeyoo@gmail.com, linux-mm@kvack.org,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
chensong_2000@189.cn, xiehuan09@gmail.com
Subject: Re: [RFC][PATCH 3/4] filemap: implement filemap allocate post callback for page_owner
Date: Thu, 9 Nov 2023 15:46:58 +0000 [thread overview]
Message-ID: <ZUz+8nlEaRMU8QaO@casper.infradead.org> (raw)
In-Reply-To: <27f7b8c52e2da5e8003de2226bff181fdc7a7f69@linux.dev>
On Thu, Nov 09, 2023 at 03:43:10PM +0000, jeff.xie@linux.dev wrote:
> November 9, 2023 at 10:09 PM, "Matthew Wilcox" <willy@infradead.org> wrote:
> > Why not just walk the rmap directly to find out where it's mapped in
> > any process instead of the one which allocated it?
>
> Since the page_owner's result only shows which PID allocated this page, we only need to obtain the address space of the corresponding process for that PID.
But that's probably uninteresting. Consider, eg, a page from libc.
That's going to be mapped by hundreds or even thousands of processes.
And the one which originally allocated it may well have exited by this
point; files often live long past the process that first reads them.
next prev parent reply other threads:[~2023-11-09 15:49 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-09 3:25 [RFC][PATCH 0/4] mm, page_owner: make the owner in page owner clearer Jeff Xie
2023-11-09 3:25 ` [RFC][PATCH 1/4] mm, page_owner: add folio allocate post callback for struct page_owner to make the " Jeff Xie
2023-11-09 13:59 ` Matthew Wilcox
2023-11-09 15:25 ` Jeff Xie
2023-11-09 15:36 ` Matthew Wilcox
2023-11-09 16:04 ` jeff.xie
2023-11-09 16:38 ` Matthew Wilcox
2023-11-09 3:25 ` [RFC][PATCH 2/4] mm, slub: implement slub allocate post callback for page_owner Jeff Xie
2023-11-09 14:05 ` Matthew Wilcox
2023-11-09 15:34 ` jeff.xie
2023-11-09 3:25 ` [RFC][PATCH 3/4] filemap: implement filemap " Jeff Xie
2023-11-09 14:09 ` Matthew Wilcox
2023-11-09 15:43 ` jeff.xie
2023-11-09 15:46 ` Matthew Wilcox [this message]
2023-11-09 22:16 ` kernel test robot
2023-11-09 3:25 ` [RFC][PATCH 4/4] mm/rmap: implement anonmap " Jeff Xie
2023-11-09 14:10 ` Matthew Wilcox
2023-11-09 15:47 ` jeff.xie
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