linux-kernel - Re: [PATCH v4 1/5] mm/page_idle: Add per-pid idle page tracking using virtual indexing

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20190807130122.f148548c05ec07e7b716457e@linux-foundation.org>
Date:   Wed, 7 Aug 2019 13:01:22 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Joel Fernandes <joel@...lfernandes.org>
Cc:     linux-kernel@...r.kernel.org,
        Alexey Dobriyan <adobriyan@...il.com>,
        Borislav Petkov <bp@...en8.de>,
        Brendan Gregg <bgregg@...flix.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Christian Hansen <chansen3@...co.com>, dancol@...gle.com,
        fmayer@...gle.com, "H. Peter Anvin" <hpa@...or.com>,
        Ingo Molnar <mingo@...hat.com>,
        Jonathan Corbet <corbet@....net>,
        Kees Cook <keescook@...omium.org>, kernel-team@...roid.com,
        linux-api@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        Michal Hocko <mhocko@...e.com>,
        Mike Rapoport <rppt@...ux.ibm.com>, minchan@...nel.org,
        namhyung@...gle.com, paulmck@...ux.ibm.com,
        Robin Murphy <robin.murphy@....com>,
        Roman Gushchin <guro@...com>,
        Stephen Rothwell <sfr@...b.auug.org.au>, surenb@...gle.com,
        Thomas Gleixner <tglx@...utronix.de>, tkjos@...gle.com,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Will Deacon <will@...nel.org>,
        Brendan Gregg <brendan.d.gregg@...il.com>
Subject: Re: [PATCH v4 1/5] mm/page_idle: Add per-pid idle page tracking
 using virtual indexing

On Wed, 7 Aug 2019 06:00:13 -0400 Joel Fernandes <joel@...lfernandes.org> wrote:

> > > 8 files changed, 376 insertions(+), 45 deletions(-)
> > 
> > Quite a lot of new code unconditionally added to major architectures. 
> > Are we confident that everyone will want this feature?
> 
> I did not follow, could you clarify more? All of this diff stat is not to
> architecture code:


My point is that the patchset adds a lot of new code with no way in
which users can opt out.  Almost everyone gets a fatter kernel - how
many of those users will actually benefit from it?

If "not many" then shouldn't we be making it Kconfigurable?

Are there userspace tools which present this info to users or which
provide monitoring of some form?  Do major distros ship those tools? 
Do people use them?  etcetera.