linux-kernel - Re: [PATCH] tools/drgn: Add script to display page state for a given PID and VADDR

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Message-ID: <7e45afc8-dde0-481a-b0bf-0237f551ebe0@paulmck-laptop>
Date: Tue, 15 Apr 2025 21:02:12 -0700
From: "Paul E. McKenney" <paulmck@...nel.org>
To: Sweet Tea Dorminy <sweettea-kernel@...miny.me>
Cc: Ye Liu <ye.liu@...ux.dev>, Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-toolchains@...r.kernel.org,
	linux-mm@...ck.org, Ye Liu <liuye@...inos.cn>,
	Omar Sandoval <osandov@...ndov.com>
Subject: Re: [PATCH] tools/drgn: Add script to display page state for a given
 PID and VADDR

On Tue, Apr 15, 2025 at 11:28:41PM -0400, Sweet Tea Dorminy wrote:
> 
> 
> On 4/15/25 10:46 PM, Ye Liu wrote:
> > 
> > 在 2025/4/16 10:14, Andrew Morton 写道:
> > > On Tue, 15 Apr 2025 15:50:24 +0800 Ye Liu <ye.liu@...ux.dev> wrote:
> > > 
> > > > From: Ye Liu <liuye@...inos.cn>
> > > > 
> > > > Introduces a new drgn script, `show_page_info.py`, which allows users
> > > > to analyze the state of a page given a process ID (PID) and a virtual
> > > > address (VADDR). This can help kernel developers or debuggers easily
> > > > inspect page-related information in a live kernel or vmcore.
> > > > 
> > > > The script extracts information such as the page flags, mapping, and
> > > > other metadata relevant to diagnosing memory issues.
> > > > 
> > > > Currently, there is no specific maintainer entry for `tools/drgn/` in the
> > > > MAINTAINERS file. Therefore, this patch is sent to the general kernel and
> > > > tools mailing lists for review.
> > > Help.  My copy of linux has no tools/drgn/
> > I noticed that the current upstream Linux tree doesn't contain a
> > `tools/drgn/` directory.
> > 
> > I'm interested in contributing a drgn script tool as well.
> > Given that this directory does not yet exist in mainline, where would
> > be the appropriate place to add new drgn scripts? Would it make sense
> > to create a new `tools/drgn/` directory, or is there a preferred
> > location for such debugging scripts?
> > 
> > Thanks,
> > Ye
> 
> I believe the traditional thing to do with new drgn scripts is to add them
> to the contrib directory in drgn via pull request:
> https://github.com/osandov/drgn/blob/main/contrib/README.rst

I have an RCU-related drgn script in tools/rcu, so maybe this one should
go in tools/mm.

							Thanx, Paul