From: Joonsoo Kim <iamjoonsoo.kim@lge.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Mel Gorman <mgorman@suse.de>, Hugh Dickins <hughd@google.com>,
Rik van Riel <riel@redhat.com>, Ingo Molnar <mingo@kernel.org>,
Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>,
Hillf Danton <dhillf@gmail.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH 6/9] mm/rmap: use rmap_walk() in try_to_unmap()
Date: Tue, 3 Dec 2013 11:08:32 +0900 [thread overview]
Message-ID: <20131203020832.GD31168@lge.com> (raw)
In-Reply-To: <20131202150107.7a814d0753356afc47b58b09@linux-foundation.org>
On Mon, Dec 02, 2013 at 03:01:07PM -0800, Andrew Morton wrote:
> On Thu, 28 Nov 2013 16:48:43 +0900 Joonsoo Kim <iamjoonsoo.kim@lge.com> wrote:
>
> > Now, we have an infrastructure in rmap_walk() to handle difference
> > from variants of rmap traversing functions.
> >
> > So, just use it in try_to_unmap().
> >
> > In this patch, I change following things.
> >
> > 1. enable rmap_walk() if !CONFIG_MIGRATION.
> > 2. mechanical change to use rmap_walk() in try_to_unmap().
> >
> > ...
> >
> > --- a/include/linux/rmap.h
> > +++ b/include/linux/rmap.h
> > @@ -190,7 +190,7 @@ int page_referenced_one(struct page *, struct vm_area_struct *,
> >
> > int try_to_unmap(struct page *, enum ttu_flags flags);
> > int try_to_unmap_one(struct page *, struct vm_area_struct *,
> > - unsigned long address, enum ttu_flags flags);
> > + unsigned long address, void *arg);
>
> This change is ugly and unchangelogged.
>
> Also, "enum ttu_flags flags" was nice and meaningful, but "void *arg"
> conveys far less information. A suitable way to address this
> shortcoming is to document `arg' at the try_to_unmap_one() definition
> site. try_to_unmap_one() doesn't actually have any documentation at
> this stage - let's please fix that?
Okay. I will add some comments.
> >
> > ...
> >
> > @@ -1509,6 +1510,11 @@ bool is_vma_temporary_stack(struct vm_area_struct *vma)
> > return false;
> > }
> >
> > +static int skip_vma_temporary_stack(struct vm_area_struct *vma, void *arg)
> > +{
> > + return (int)is_vma_temporary_stack(vma);
> > +}
>
> The (int) cast is unneeded - the compiler will turn a bool into an int.
>
> Should this function (and rmap_walk_control.skip()) really be returning
> a bool?
Okay. Will do.
>
> The name of this function is poor: "skip_foo" implies that the function
> will skip over a foo. But that isn't what this function does. Please
> choose something which accurately reflects the function's behavior.
Okay.
Thanks.
next prev parent reply other threads:[~2013-12-03 2:06 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-28 7:48 [PATCH 0/9] mm/rmap: unify rmap traversing functions through rmap_walk Joonsoo Kim
2013-11-28 7:48 ` [PATCH 1/9] mm/rmap: recompute pgoff for huge page Joonsoo Kim
2013-12-02 20:09 ` Naoya Horiguchi
2013-12-02 22:44 ` Andrew Morton
2013-12-03 2:01 ` Joonsoo Kim
2013-11-28 7:48 ` [PATCH 2/9] mm/rmap: factor nonlinear handling out of try_to_unmap_file() Joonsoo Kim
2013-12-02 20:09 ` Naoya Horiguchi
2013-11-28 7:48 ` [PATCH 3/9] mm/rmap: factor lock function out of rmap_walk_anon() Joonsoo Kim
2013-12-02 20:09 ` Naoya Horiguchi
2013-11-28 7:48 ` [PATCH 4/9] mm/rmap: make rmap_walk to get the rmap_walk_control argument Joonsoo Kim
2013-12-02 20:09 ` Naoya Horiguchi
2013-12-02 22:51 ` Andrew Morton
2013-12-03 2:03 ` Joonsoo Kim
2013-12-02 22:52 ` Andrew Morton
2013-11-28 7:48 ` [PATCH 5/9] mm/rmap: extend rmap_walk_xxx() to cope with different cases Joonsoo Kim
2013-12-02 20:09 ` Naoya Horiguchi
2013-12-03 2:05 ` Joonsoo Kim
2013-11-28 7:48 ` [PATCH 6/9] mm/rmap: use rmap_walk() in try_to_unmap() Joonsoo Kim
2013-12-02 20:09 ` Naoya Horiguchi
2013-12-02 23:01 ` Andrew Morton
2013-12-03 2:08 ` Joonsoo Kim [this message]
2013-11-28 7:48 ` [PATCH 7/9] mm/rmap: use rmap_walk() in try_to_munlock() Joonsoo Kim
2013-12-02 20:09 ` Naoya Horiguchi
2013-11-28 7:48 ` [PATCH 8/9] mm/rmap: use rmap_walk() in page_referenced() Joonsoo Kim
2013-12-02 20:10 ` Naoya Horiguchi
2013-11-28 7:48 ` [PATCH 9/9] mm/rmap: use rmap_walk() in page_mkclean() Joonsoo Kim
2013-12-02 20:10 ` Naoya Horiguchi
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20131203020832.GD31168@lge.com \
--to=iamjoonsoo.kim@lge.com \
--cc=akpm@linux-foundation.org \
--cc=dhillf@gmail.com \
--cc=hughd@google.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mgorman@suse.de \
--cc=mingo@kernel.org \
--cc=n-horiguchi@ah.jp.nec.com \
--cc=riel@redhat.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).