linux-kernel - Re: Boot failures with "mm/sparse: Remove CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER" on powerpc (was Re: mmotm 2018-07-10-16-50 uploaded)

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Date:   Thu, 12 Jul 2018 15:24:38 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Oscar Salvador <osalvador.vilardaga@...il.com>,
        Pavel Tatashin <pasha.tatashin@...cle.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, broonie@...nel.org,
        mhocko@...e.cz, Stephen Rothwell <sfr@...b.auug.org.au>,
        linux-next@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        Linux Memory Management List <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>, mm-commits@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, bhe@...hat.com,
        aneesh.kumar@...ux.ibm.com, khandual@...ux.vnet.ibm.com
Subject: Re: Boot failures with "mm/sparse: Remove CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER" on powerpc (was Re: mmotm 2018-07-10-16-50 uploaded)

Oscar Salvador <osalvador.vilardaga@...il.com> writes:
> El dc., 11 jul. 2018 , 15:56, Pavel Tatashin <pasha.tatashin@...cle.com> va
> escriure:
>
>> I am OK, if this patch is removed from Baoquan's series. But, I would
>> still like to get rid of CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER, I
>> can work on this in my sparse_init re-write series. ppc64 should
>> really fallback safely to small chunks allocs, and if it does not
>> there is some existing bug. Michael please send the config that you
>> used.
>>
>> Thank you,
>> Pavel
>> On Wed, Jul 11, 2018 at 9:37 AM Oscar Salvador
>> <osalvador@...hadventures.net> wrote:
>> >
>> > On Wed, Jul 11, 2018 at 10:49:58PM +1000, Michael Ellerman wrote:
>> > > akpm@...ux-foundation.org writes:
>> > > > The mm-of-the-moment snapshot 2018-07-10-16-50 has been uploaded to
>> > > >
>> > > >    http://www.ozlabs.org/~akpm/mmotm/
>> > > ...
>> > >
>> > > > * mm-sparse-add-a-static-variable-nr_present_sections.patch
>> > > > * mm-sparsemem-defer-the-ms-section_mem_map-clearing.patch
>> > > > * mm-sparsemem-defer-the-ms-section_mem_map-clearing-fix.patch
>> > > > *
>> mm-sparse-add-a-new-parameter-data_unit_size-for-alloc_usemap_and_memmap.patch
>> > > > * mm-sparse-optimize-memmap-allocation-during-sparse_init.patch
>> > > > *
>> mm-sparse-optimize-memmap-allocation-during-sparse_init-checkpatch-fixes.patch
>> > >
>> > > > * mm-sparse-remove-config_sparsemem_alloc_mem_map_together.patch
>> > >
>> > > This seems to be breaking my powerpc pseries qemu boots.
>> > >
>> > > The boot log with some extra debug shows eg:
>> > >
>> > >   $ make pseries_le_defconfig
>> >
>> > Could you please share the config?
>> > I was not able to find such config in the kernel tree.
>>
>>
> I just roughly check, but if I checked the right place,
> vmemmap_populated() checks for the section to contain the flags we are
> setting in sparse_init_one_section().

Yes.

> But with this patch, we populate first everything, and then we call
> sparse_init_one_section() in sparse_init().
> As I said I could be mistaken because I just checked the surface.

Yeah I think that's correct.

This might just be a bug in our code, let me look at it a bit.

cheers