From: Dong Aisheng <dongas86@gmail.com>
To: Mike Rapoport <rppt@kernel.org>
Cc: Dong Aisheng <aisheng.dong@nxp.com>,
linux-mm@kvack.org, open list <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH 3/5] mm/sparse: move mem_sections allocation out of memory_present()
Date: Tue, 18 May 2021 18:45:08 +0800 [thread overview]
Message-ID: <CAA+hA=TZyVcSfbBzJvzwULhbvfC00JP=_xam3JoirdnTiDd_KQ@mail.gmail.com> (raw)
In-Reply-To: <YKOTDumqMIFfqc+f@kernel.org>
On Tue, May 18, 2021 at 6:12 PM Mike Rapoport <rppt@kernel.org> wrote:
>
> On Mon, May 17, 2021 at 07:20:42PM +0800, Dong Aisheng wrote:
> > The only path to call memory_present() is from memblocks_present().
> > The struct mem_section **mem_section only needs to be initialized once,
> > so no need put the initialization/allocation code in memory_present()
> > which will be called multiple times for each section.
> >
> > After moving, the 'unlikely' condition statement becomes to be
> > meaningless as it's only initialized one time, so dropped as well.
> >
> > Cc: Andrew Morton <akpm@linux-foundation.org>
> > Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
> > ---
> > mm/sparse.c | 23 ++++++++++-------------
> > 1 file changed, 10 insertions(+), 13 deletions(-)
> >
> > diff --git a/mm/sparse.c b/mm/sparse.c
> > index 98bfacc763da..df4418c12f04 100644
> > --- a/mm/sparse.c
> > +++ b/mm/sparse.c
> > @@ -254,19 +254,6 @@ static void __init memory_present(int nid, unsigned long start, unsigned long en
> > {
> > unsigned long pfn;
> >
> > -#ifdef CONFIG_SPARSEMEM_EXTREME
> > - if (unlikely(!mem_section)) {
> > - unsigned long size, align;
> > -
> > - size = sizeof(struct mem_section *) * NR_SECTION_ROOTS;
> > - align = 1 << (INTERNODE_CACHE_SHIFT);
> > - mem_section = memblock_alloc(size, align);
> > - if (!mem_section)
> > - panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
> > - __func__, size, align);
> > - }
> > -#endif
>
> Maybe split this into a helper function and call it directly from
> sparse_init()?
>
Sounds good to me
e.g. sparse_alloc_section_root() called directly from sparse_init().
Thanks for the suggestion
Regards
Aisheng
> > -
> > start &= PAGE_SECTION_MASK;
> > mminit_validate_memmodel_limits(&start, &end);
> > for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION) {
> > @@ -292,9 +279,19 @@ static void __init memory_present(int nid, unsigned long start, unsigned long en
> > */
> > static void __init memblocks_present(void)
> > {
> > + unsigned long __maybe_unused size, align;
> > unsigned long start, end;
> > int i, nid;
> >
> > +#ifdef CONFIG_SPARSEMEM_EXTREME
> > + size = sizeof(struct mem_section *) * NR_SECTION_ROOTS;
> > + align = 1 << (INTERNODE_CACHE_SHIFT);
> > + mem_section = memblock_alloc(size, align);
> > + if (!mem_section)
> > + panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
> > + __func__, size, align);
> > +#endif
> > +
> > for_each_mem_pfn_range(i, MAX_NUMNODES, &start, &end, &nid)
> > memory_present(nid, start, end);
> > }
> > --
> > 2.25.1
> >
> >
>
> --
> Sincerely yours,
> Mike.
next prev parent reply other threads:[~2021-05-18 10:46 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-17 11:20 [PATCH 0/5] mm/sparse: a few minor fixes and improvements Dong Aisheng
2021-05-17 11:20 ` [PATCH 1/5] mm: correct SECTION_SHIFT name in code comments Dong Aisheng
2021-05-17 17:17 ` Yu Zhao
2021-05-18 2:48 ` Aisheng Dong
2021-05-17 11:20 ` [PATCH 2/5] mm/sparse: free section usage memory in case populate_section_memmap failed Dong Aisheng
2021-05-18 10:09 ` Mike Rapoport
2021-05-18 10:25 ` Dong Aisheng
2021-05-18 11:43 ` Mike Rapoport
2021-05-19 4:04 ` Dong Aisheng
2021-05-25 7:52 ` David Hildenbrand
2021-05-25 8:15 ` Dong Aisheng
2021-05-17 11:20 ` [PATCH 3/5] mm/sparse: move mem_sections allocation out of memory_present() Dong Aisheng
2021-05-18 10:12 ` Mike Rapoport
2021-05-18 10:45 ` Dong Aisheng [this message]
2021-05-17 11:20 ` [PATCH 4/5] mm: rename the global section array to mem_sections Dong Aisheng
2021-05-25 7:55 ` David Hildenbrand
2021-05-25 8:32 ` Dong Aisheng
2021-05-17 11:20 ` [PATCH 5/5] mm/page_alloc: improve memmap_pages and dma_reserve dbg msg Dong Aisheng
2021-05-25 8:01 ` David Hildenbrand
2021-05-25 8:39 ` Dong Aisheng
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