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Tue, 18 May 2021 03:46:11 -0700 (PDT) MIME-Version: 1.0 References: <20210517112044.233138-1-aisheng.dong@nxp.com> <20210517112044.233138-4-aisheng.dong@nxp.com> In-Reply-To: From: Dong Aisheng Date: Tue, 18 May 2021 18:45:08 +0800 Message-ID: Subject: Re: [PATCH 3/5] mm/sparse: move mem_sections allocation out of memory_present() To: Mike Rapoport Cc: Dong Aisheng , linux-mm@kvack.org, open list , Andrew Morton Content-Type: text/plain; charset="UTF-8" Authentication-Results: imf22.hostedemail.com; dkim=pass header.d=gmail.com header.s=20161025 header.b=hE+Os49H; spf=pass (imf22.hostedemail.com: domain of dongas86@gmail.com designates 209.85.210.52 as permitted sender) smtp.mailfrom=dongas86@gmail.com; dmarc=pass (policy=none) header.from=gmail.com X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: C7E93C0007CA X-Stat-Signature: omiffiu1zbxfhnfbqsghhg1e1aiffzg8 X-HE-Tag: 1621334770-214318 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Tue, May 18, 2021 at 6:12 PM Mike Rapoport 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 > > Signed-off-by: Dong Aisheng > > --- > > 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.