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From: Dan Williams <dan.j.williams@intel.com>
To: Qian Cai <cai@lca.pw>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	 Oscar Salvador <osalvador@suse.de>,
	Linux MM <linux-mm@kvack.org>,
	 Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH -next] mm/hotplug: skip bad PFNs from pfn_to_online_page()
Date: Fri, 14 Jun 2019 11:03:55 -0700
Message-ID: <CAPcyv4jAzMzFjSD22VU9Csw+kgGbf8r=XHbdJYzgL_uH_GVEvw@mail.gmail.com> (raw)
In-Reply-To: <1560524365.5154.21.camel@lca.pw>

On Fri, Jun 14, 2019 at 7:59 AM Qian Cai <cai@lca.pw> wrote:
>
> On Fri, 2019-06-14 at 14:28 +0530, Aneesh Kumar K.V wrote:
> > Qian Cai <cai@lca.pw> writes:
> >
> >
> > > 1) offline is busted [1]. It looks like test_pages_in_a_zone() missed the
> > > same
> > > pfn_section_valid() check.
> > >
> > > 2) powerpc booting is generating endless warnings [2]. In
> > > vmemmap_populated() at
> > > arch/powerpc/mm/init_64.c, I tried to change PAGES_PER_SECTION to
> > > PAGES_PER_SUBSECTION, but it alone seems not enough.
> > >
> >
> > Can you check with this change on ppc64.  I haven't reviewed this series yet.
> > I did limited testing with change . Before merging this I need to go
> > through the full series again. The vmemmap poplulate on ppc64 needs to
> > handle two translation mode (hash and radix). With respect to vmemap
> > hash doesn't setup a translation in the linux page table. Hence we need
> > to make sure we don't try to setup a mapping for a range which is
> > arleady convered by an existing mapping.
>
> It works fine.

Strange... it would only change behavior if valid_section() is true
when pfn_valid() is not or vice versa. They "should" be identical
because subsection-size == section-size on PowerPC, at least with the
current definition of SUBSECTION_SHIFT. I suspect maybe
free_area_init_nodes() is too late to call subsection_map_init() for
PowerPC.


  reply index

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-12 19:15 Qian Cai
2019-06-12 19:37 ` Dan Williams
2019-06-12 19:38   ` Dan Williams
2019-06-12 21:47     ` Qian Cai
2019-06-12 21:52       ` Dan Williams
2019-06-12 23:13         ` Dan Williams
2019-06-13  0:06       ` Dan Williams
2019-06-14  8:58       ` Aneesh Kumar K.V
2019-06-14 14:59         ` Qian Cai
2019-06-14 18:03           ` Dan Williams [this message]
2019-06-14 18:57             ` Dan Williams
2019-06-14 19:40               ` Qian Cai
2019-06-14 19:48                 ` Dan Williams
2019-06-14 20:43                   ` Qian Cai
2019-06-16 15:42                     ` Dan Williams
2019-06-17  2:25                       ` Qian Cai
2019-06-14 15:35         ` Oscar Salvador
2019-06-14 16:18           ` Aneesh Kumar K.V
2019-06-14 16:22             ` Dan Williams
2019-06-14 16:26               ` Aneesh Kumar K.V
2019-06-14 16:36                 ` Dan Williams
2019-06-14 16:50                   ` Aneesh Kumar K.V
2019-06-14 16:55                   ` Aneesh Kumar K.V
2019-06-14 17:08                     ` Jeff Moyer
2019-06-14 17:14                       ` Dan Williams
2019-06-14 17:40                       ` Aneesh Kumar K.V
2019-06-16  3:49               ` Aneesh Kumar K.V
2019-06-13 18:42   ` Qian Cai
2019-06-14  1:17     ` Dan Williams
2019-06-14  1:29       ` Qian Cai

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