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Date: Thu, 9 Jul 2020 05:13:19 +0000
From: Justin He <Justin.He@....com>
To: Dan Williams <dan.j.williams@...el.com>
CC: Catalin Marinas <Catalin.Marinas@....com>,
Will Deacon <will@...nel.org>, Tony Luck <tony.luck@...el.com>,
Fenghua Yu <fenghua.yu@...el.com>,
Yoshinori Sato <ysato@...rs.sourceforge.jp>,
Rich Felker <dalias@...c.org>,
Dave Hansen <dave.hansen@...ux.intel.com>,
Andy Lutomirski <luto@...nel.org>,
Peter Zijlstra <peterz@...radead.org>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
David Hildenbrand <david@...hat.com>, X86 ML <x86@...nel.org>,
"H. Peter Anvin" <hpa@...or.com>,
Vishal Verma <vishal.l.verma@...el.com>,
Dave Jiang <dave.jiang@...el.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Baoquan He <bhe@...hat.com>,
Chuhong Yuan <hslester96@...il.com>,
Mike Rapoport <rppt@...ux.ibm.com>,
Logan Gunthorpe <logang@...tatee.com>,
Masahiro Yamada <masahiroy@...nel.org>,
Michal Hocko <mhocko@...e.com>,
Linux ARM <linux-arm-kernel@...ts.infradead.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
"linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>,
Linux-sh <linux-sh@...r.kernel.org>,
linux-nvdimm <linux-nvdimm@...ts.01.org>,
Linux MM <linux-mm@...ck.org>,
Jonathan Cameron <Jonathan.Cameron@...wei.com>,
Kaly Xin <Kaly.Xin@....com>
Subject: RE: [PATCH v3 5/6] device-dax: use fallback nid when numa_node is
invalid
Hi Dan
> -----Original Message-----
> From: Dan Williams <dan.j.williams@...el.com>
> Sent: Thursday, July 9, 2020 11:39 AM
> To: Justin He <Justin.He@....com>
> Cc: Catalin Marinas <Catalin.Marinas@....com>; Will Deacon
> <will@...nel.org>; Tony Luck <tony.luck@...el.com>; Fenghua Yu
> <fenghua.yu@...el.com>; Yoshinori Sato <ysato@...rs.sourceforge.jp>; Rich
> Felker <dalias@...c.org>; Dave Hansen <dave.hansen@...ux.intel.com>; Andy
> Lutomirski <luto@...nel.org>; Peter Zijlstra <peterz@...radead.org>;
> Thomas Gleixner <tglx@...utronix.de>; Ingo Molnar <mingo@...hat.com>;
> Borislav Petkov <bp@...en8.de>; David Hildenbrand <david@...hat.com>; X86
> ML <x86@...nel.org>; H. Peter Anvin <hpa@...or.com>; Vishal Verma
> <vishal.l.verma@...el.com>; Dave Jiang <dave.jiang@...el.com>; Andrew
> Morton <akpm@...ux-foundation.org>; Baoquan He <bhe@...hat.com>; Chuhong
> Yuan <hslester96@...il.com>; Mike Rapoport <rppt@...ux.ibm.com>; Logan
> Gunthorpe <logang@...tatee.com>; Masahiro Yamada <masahiroy@...nel.org>;
> Michal Hocko <mhocko@...e.com>; Linux ARM <linux-arm-
> kernel@...ts.infradead.org>; Linux Kernel Mailing List <linux-
> kernel@...r.kernel.org>; linux-ia64@...r.kernel.org; Linux-sh <linux-
> sh@...r.kernel.org>; linux-nvdimm <linux-nvdimm@...ts.01.org>; Linux MM
> <linux-mm@...ck.org>; Jonathan Cameron <Jonathan.Cameron@...wei.com>; Kaly
> Xin <Kaly.Xin@....com>
> Subject: Re: [PATCH v3 5/6] device-dax: use fallback nid when numa_node is
> invalid
>
> On Wed, Jul 8, 2020 at 7:07 PM Jia He <justin.he@....com> wrote:
> >
> > numa_off is set unconditionally at the end of dummy_numa_init(),
> > even with a fake numa node. ACPI detects node id as NUMA_NO_NODE(-1) in
> > acpi_map_pxm_to_node() because it regards numa_off as turning off the
> numa
> > node. Hence dev_dax->target_node is NUMA_NO_NODE on arm64 with fake numa.
> >
> > Without this patch, pmem can't be probed as a RAM device on arm64 if
> SRAT table
> > isn't present:
> > $ndctl create-namespace -fe namespace0.0 --mode=devdax --map=dev -s 1g -
> a 64K
> > kmem dax0.0: rejecting DAX region [mem 0x240400000-0x2bfffffff] with
> invalid node: -1
> > kmem: probe of dax0.0 failed with error -22
> >
> > This fixes it by using fallback memory_add_physaddr_to_nid() as nid.
> >
> > Suggested-by: David Hildenbrand <david@...hat.com>
> > Signed-off-by: Jia He <justin.he@....com>
> > ---
> > drivers/dax/kmem.c | 21 +++++++++++++--------
> > 1 file changed, 13 insertions(+), 8 deletions(-)
> >
> > diff --git a/drivers/dax/kmem.c b/drivers/dax/kmem.c
> > index 275aa5f87399..218f66057994 100644
> > --- a/drivers/dax/kmem.c
> > +++ b/drivers/dax/kmem.c
> > @@ -31,22 +31,23 @@ int dev_dax_kmem_probe(struct device *dev)
> > int numa_node;
> > int rc;
> >
> > + /* Hotplug starting at the beginning of the next block: */
> > + kmem_start = ALIGN(res->start, memory_block_size_bytes());
> > +
> > /*
> > * Ensure good NUMA information for the persistent memory.
> > * Without this check, there is a risk that slow memory
> > * could be mixed in a node with faster memory, causing
> > - * unavoidable performance issues.
> > + * unavoidable performance issues. Furthermore, fallback node
> > + * id can be used when numa_node is invalid.
> > */
> > numa_node = dev_dax->target_node;
> > if (numa_node < 0) {
> > - dev_warn(dev, "rejecting DAX region %pR with invalid
> node: %d\n",
> > - res, numa_node);
> > - return -EINVAL;
> > + numa_node = memory_add_physaddr_to_nid(kmem_start);
>
> I think this fixup belongs to the core to set a fallback value for
> dev_dax->target_node.
>
> I'm close to having patches to provide a functional
> phys_addr_to_target_node() for arm64.
Should My this patch(5/6) wait on your new phys_addr_to_target_node() patch?
Thanks for the clarification.
--
Cheers,
Justin (Jia He)
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