linux-kernel - Re: [PATCH V2] x86/mm: Tracking linear mapping split events

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Message-ID: <YBHc4JHc4ogwV93W@slm.duckdns.org>
Date:   Wed, 27 Jan 2021 16:36:32 -0500
From:   Tejun Heo <tj@...nel.org>
To:     Dave Hansen <dave.hansen@...el.com>
Cc:     Saravanan D <saravanand@...com>, x86@...nel.org,
        dave.hansen@...ux.intel.com, luto@...nel.org, peterz@...radead.org,
        linux-kernel@...r.kernel.org, kernel-team@...com
Subject: Re: [PATCH V2] x86/mm: Tracking linear mapping split events

Hello,

On Wed, Jan 27, 2021 at 01:32:03PM -0800, Dave Hansen wrote:
> >>  arch/x86/mm/pat/set_memory.c  | 117 ++++++++++++++++++++++++++++++++++
> >>  include/linux/vm_event_item.h |   8 +++
> >>  mm/vmstat.c                   |   8 +++
> >>  3 files changed, 133 insertions(+)
> > 
> > So, now the majority of the added code is to add debugfs knobs which don't
> > provide anything that userland can't already do by simply reading the
> > monotonic counters.
> > 
> > Dave, are you still set on the resettable counters?
> 
> Not *really*.  But, you either need them to be resettable, or you need
> to expect your users to take snapshots and compare changes over time.
> Considering how much more code it is, though, I'm not super attached to it.

Saravanan, can you please drop the debugfs portion and repost?

Thanks.

-- 
tejun