From: Leonardo Bras <leonardo@linux.ibm.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: "Song Liu" <songliubraving@fb.com>,
"Michal Hocko" <mhocko@suse.com>,
"Dmitry V. Levin" <ldv@altlinux.org>,
"Keith Busch" <keith.busch@intel.com>,
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"Elena Reshetova" <elena.reshetova@intel.com>,
linux-arch@vger.kernel.org,
"Santosh Sivaraj" <santosh@fossix.org>,
"Davidlohr Bueso" <dave@stgolabs.net>,
"Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
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kvm-ppc@vger.kernel.org, "Thomas Gleixner" <tglx@linutronix.de>,
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linuxppc-dev@lists.ozlabs.org, "Roman Gushchin" <guro@fb.com>,
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"Al Viro" <viro@zeniv.linux.org.uk>
Subject: Re: [PATCH v5 01/11] asm-generic/pgtable: Adds generic functions to monitor lockless pgtable walks
Date: Wed, 09 Oct 2019 18:09:41 +0000 [thread overview]
Message-ID: <ebf5d7357f194debc3bd6e91e0a8da4202c87653.camel@linux.ibm.com> (raw)
In-Reply-To: <20191004112844.GC19463@hirez.programming.kicks-ass.net>
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On Fri, 2019-10-04 at 13:28 +0200, Peter Zijlstra wrote:
> > Could you please explain it?
> > I mean, why this breaks tmpfs-thp?
> > Also, why mm_cpumask() is also broken?
>
> Because shared pages are not bound by a mm; or does it not share the thp
> state between mappings?
By what I could understand, even though the memory is shared, the
mapping may differ for different processes (i.e. the same physical
memory that is mapped as a hugepage in process A can be mapped as a lot
of smallpages in process B).
Did I miss something here?
> And once you (re)figure it out, please write it down. It is a crucial
> bit of the puzzle and needs to be part of the Changelogs.
I am still investing time studying this. More on this later :)
Thanks!
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prev parent reply other threads:[~2019-10-09 18:09 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20191003013325.2614-1-leonardo@linux.ibm.com>
[not found] ` <20191003072952.GN4536@hirez.programming.kicks-ass.net>
2019-10-03 20:36 ` [PATCH v5 00/11] Introduces new count-based method for tracking lockless pagetable walks Leonardo Bras
[not found] ` <99754d82-33c5-a54f-8607-b6bf151069d4@nvidia.com>
2019-10-03 21:38 ` Leonardo Bras
2019-10-04 11:42 ` Peter Zijlstra
2019-10-04 12:57 ` Peter Zijlstra
[not found] ` <20191003013325.2614-11-leonardo@linux.ibm.com>
[not found] ` <20191003074432.GO4536@hirez.programming.kicks-ass.net>
2019-10-03 20:40 ` [PATCH v5 10/11] mm/Kconfig: Adds config option to track " Leonardo Bras
[not found] ` <20191003013325.2614-2-leonardo@linux.ibm.com>
[not found] ` <20191003071145.GM4536@hirez.programming.kicks-ass.net>
[not found] ` <20191003115141.GJ4581@hirez.programming.kicks-ass.net>
2019-10-03 21:24 ` [PATCH v5 01/11] asm-generic/pgtable: Adds generic functions to monitor lockless pgtable walks Leonardo Bras
2019-10-04 11:28 ` Peter Zijlstra
2019-10-09 18:09 ` Leonardo Bras [this message]
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