Re: [PATCH v1 04/11] mm/memremap: add ZONE_DEVICE support for compound pages

On Wed, May 05, 2021 at 11:44:29AM -0700, Dan Williams wrote: > > @@ -6285,6 +6285,8 @@ void __ref memmap_init_zone_device(struct zone *zone, > > unsigned long pfn, end_pfn = start_pfn + nr_pages; > > struct pglist_data *pgdat = zone->zone_pgdat; > > struct vmem_altmap

Re: [PATCH v1 04/11] mm/memremap: add ZONE_DEVICE support for compound pages

On 5/5/21 7:44 PM, Dan Williams wrote: > On Thu, Mar 25, 2021 at 4:10 PM Joao Martins > wrote: >> >> Add a new align property for struct dev_pagemap which specifies that a >> pagemap is composed of a set of compound pages of size @align, instead >> of base pages. When these pages are

Re: [PATCH v1 05/11] mm/sparse-vmemmap: add a pgmap argument to section activation

On 5/5/21 11:34 PM, Dan Williams wrote: > On Thu, Mar 25, 2021 at 4:10 PM Joao Martins > wrote: >> >> @altmap is stored in a dev_pagemap, but it will be repurposed for >> hotplug memory for storing the memmap in the hotplugged memory[*] and >> reusing the altmap infrastructure to that end.

Re: [PATCH v1 05/11] mm/sparse-vmemmap: add a pgmap argument to section activation

On Wed, May 5, 2021 at 3:38 PM Joao Martins wrote: > > > > On 5/5/21 11:34 PM, Dan Williams wrote: > > On Thu, Mar 25, 2021 at 4:10 PM Joao Martins > > wrote: > >> > >> @altmap is stored in a dev_pagemap, but it will be repurposed for > >> hotplug memory for storing the memmap in the hotplugged

[PATCH v2] powerpc/papr_scm: Reduce error severity if nvdimm stats inaccessible

Currently drc_pmem_qeury_stats() generates a dev_err in case "Enable Performance Information Collection" feature is disabled from HMC or performance stats are not available for an nvdimm. The error is of the form below: papr_scm ibm,persistent-memory:ibm,pmemory@44104001: Failed to query

Re: [PATCH v1 04/11] mm/memremap: add ZONE_DEVICE support for compound pages

On Wed, May 5, 2021 at 3:36 PM Joao Martins wrote: [..] > > Ah yup, my eyes glazed over that. I think this is another place that > > benefits from a more specific name than "align". "pfns_per_compound" > > "compound_pfns"? > > > We are still describing a page, just not a base page. So perhaps >

Re: [PATCH v1 06/11] mm/sparse-vmemmap: refactor vmemmap_populate_basepages()

I suspect it's a good sign I'm only finding cosmetic and changelog changes in the review... I have some more: A year for now if I'm tracking down a problem and looking through mm commits I would appreciate a subject line like the following: "refactor core of vmemmap_populate_basepages() to

Re: [PATCH v1 05/11] mm/sparse-vmemmap: add a pgmap argument to section activation

On Thu, Mar 25, 2021 at 4:10 PM Joao Martins wrote: > > @altmap is stored in a dev_pagemap, but it will be repurposed for > hotplug memory for storing the memmap in the hotplugged memory[*] and > reusing the altmap infrastructure to that end. This is to say that > altmap can't be replaced with a

Re: [PATCH v1 04/11] mm/memremap: add ZONE_DEVICE support for compound pages

On 5/5/21 11:20 PM, Dan Williams wrote: > On Wed, May 5, 2021 at 12:50 PM Joao Martins > wrote: >> On 5/5/21 7:44 PM, Dan Williams wrote: >>> On Thu, Mar 25, 2021 at 4:10 PM Joao Martins >>> wrote: Add a new align property for struct dev_pagemap which specifies that a pagemap is

Re: [PATCH v1 04/11] mm/memremap: add ZONE_DEVICE support for compound pages

On Thu, Mar 25, 2021 at 4:10 PM Joao Martins wrote: > > Add a new align property for struct dev_pagemap which specifies that a > pagemap is composed of a set of compound pages of size @align, instead > of base pages. When these pages are initialised, most are initialised as > tail pages instead

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[PATCH] powerpc/papr_scm: Make 'perf_stats' invisible if perf-stats unavailable

In case performance stats for an nvdimm are not available, reading the 'perf_stats' sysfs file returns an -ENOENT error. A better approach is to make the 'perf_stats' file entirely invisible to indicate that performance stats for an nvdimm are unavailable. So this patch updates

Re: [PATCH] powerpc/papr_scm: Make 'perf_stats' invisible if perf-stats unavailable

Hi Vaibhav, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on powerpc/next] [also build test WARNING on v5.12 next-20210505] [cannot apply to scottwood/next mpe/next] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting

Re: [PATCH v18 0/9] mm: introduce memfd_secret system call to create "secret" memory areas

On Wed, 3 Mar 2021 18:22:00 +0200 Mike Rapoport wrote: > This is an implementation of "secret" mappings backed by a file descriptor. > > The file descriptor backing secret memory mappings is created using a > dedicated memfd_secret system call The desired protection mode for the > memory is

Re: [PATCH v1 04/11] mm/memremap: add ZONE_DEVICE support for compound pages

On Wed, May 5, 2021 at 12:50 PM Joao Martins wrote: > > > > On 5/5/21 7:44 PM, Dan Williams wrote: > > On Thu, Mar 25, 2021 at 4:10 PM Joao Martins > > wrote: > >> > >> Add a new align property for struct dev_pagemap which specifies that a > >> pagemap is composed of a set of compound pages of

Re: [PATCH] powerpc/papr_scm: Make 'perf_stats' invisible if perf-stats unavailable

Vaibhav Jain writes: > In case performance stats for an nvdimm are not available, reading the > 'perf_stats' sysfs file returns an -ENOENT error. A better approach is > to make the 'perf_stats' file entirely invisible to indicate that > performance stats for an nvdimm are unavailable. > > So

Re: [bug report] system panic at nfit_get_smbios_id+0x6e/0xf0 [nfit] during boot

On Sat, May 1, 2021 at 2:05 PM Dan Williams wrote: > > On Fri, Apr 30, 2021 at 7:28 PM Yi Zhang wrote: > > > > Hi > > > > With the latest Linux tree, my DCPMM server boot failed with the > > bellow panic log, pls help check it, let me know if you need any test > > for it. > > So v5.12 is ok but

Re: [PATCH v2] powerpc/papr_scm: Reduce error severity if nvdimm stats inaccessible

On Thu, May 06, 2021 at 12:46:06AM +0530, Vaibhav Jain wrote: > Currently drc_pmem_qeury_stats() generates a dev_err in case > "Enable Performance Information Collection" feature is disabled from > HMC or performance stats are not available for an nvdimm. The error is > of the form below: > >

Re: [PATCH v1 07/11] mm/sparse-vmemmap: populate compound pagemaps

On Thu, Mar 25, 2021 at 4:10 PM Joao Martins wrote: > > A compound pagemap is a dev_pagemap with @align > PAGE_SIZE and it > means that pages are mapped at a given huge page alignment and utilize > uses compound pages as opposed to order-0 pages. > > To minimize struct page overhead we take

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