From: Qian Cai <cai@lca.pw>
To: Mike Rapoport <rppt@kernel.org>, Baoquan He <bhe@redhat.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Brian Cain <bcain@codeaurora.org>,
Catalin Marinas <catalin.marinas@arm.com>,
"David S. Miller" <davem@davemloft.net>,
Geert Uytterhoeven <geert@linux-m68k.org>,
Greentime Hu <green.hu@gmail.com>,
Greg Ungerer <gerg@linux-m68k.org>, Guan Xuetao <gxt@pku.edu.cn>,
Guo Ren <guoren@kernel.org>,
Heiko Carstens <heiko.carstens@de.ibm.com>,
Helge Deller <deller@gmx.de>,
Hoan Tran <Hoan@os.amperecomputing.com>,
"James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>,
Jonathan Corbet <corbet@lwn.net>,
Ley Foon Tan <ley.foon.tan@intel.com>,
Mark Salter <msalter@redhat.com>,
Matt Turner <mattst88@gmail.com>,
Max Filippov <jcmvbkbc@gmail.com>,
Michael Ellerman <mpe@ellerman.id.au>,
Michal Hocko <mhocko@kernel.org>, Michal Simek <monstr@monstr.eu>,
Nick Hu <nickhu@andestech.com>,
Paul Walmsley <paul.walmsley@sifive.com>,
Richard Weinberger <richard@nod.at>,
Rich Felker <dalias@libc.org>,
Russell King <linux@armlinux.org.uk>,
Stafford Horne <shorne@gmail.com>,
Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
Tony Luck <tony.luck@intel.com>,
Vineet Gupta <vgupta@synopsys.com>,
the arch/x86 maintainers <x86@kernel.org>,
Yoshinori Sato <ysato@users.sourceforge.jp>,
linux-alpha@vger.kernel.org, linux-arch@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-c6x-dev@linux-c6x.org, linux-csky@vger.kernel.org,
linux-doc@vger.kernel.org, linux-hexagon@vger.kernel.org,
linux-ia64@vger.kernel.org, linux-m68k@lists.linux-m68k.org,
linux-mips@vger.kernel.org, Linux-MM <linux-mm@kvack.org>,
linux-parisc@vger.kernel.org,
linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org,
linux-sh@vger.kernel.org, linux-snps-arc@lists.infradead.org,
linux-um@lists.infradead.org, linux-xtensa@linux-xtensa.org,
openrisc@lists.librecores.org, sparclinux@vger.kernel.org,
uclinux-h8-devel@lists.sourceforge.jp,
Mike Rapoport <rppt@linux.ibm.com>
Subject: Re: [PATCH 15/21] mm: memmap_init: iterate over memblock regions rather that check each PFN
Date: Mon, 20 Apr 2020 10:26:06 -0400 [thread overview]
Message-ID: <CF6E407F-17DC-427C-8203-21979FB882EF@lca.pw> (raw)
In-Reply-To: <20200412194859.12663-16-rppt@kernel.org>
> On Apr 12, 2020, at 3:48 PM, Mike Rapoport <rppt@kernel.org> wrote:
>
> From: Baoquan He <bhe@redhat.com>
>
> When called during boot the memmap_init_zone() function checks if each PFN
> is valid and actually belongs to the node being initialized using
> early_pfn_valid() and early_pfn_in_nid().
>
> Each such check may cost up to O(log(n)) where n is the number of memory
> banks, so for large amount of memory overall time spent in early_pfn*()
> becomes substantial.
>
> Since the information is anyway present in memblock, we can iterate over
> memblock memory regions in memmap_init() and only call memmap_init_zone()
> for PFN ranges that are know to be valid and in the appropriate node.
>
> Signed-off-by: Baoquan He <bhe@redhat.com>
> Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
> ---
> mm/page_alloc.c | 26 ++++++++++++++++----------
> 1 file changed, 16 insertions(+), 10 deletions(-)
>
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 7f6a3081edb8..c43ce8709457 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -5995,14 +5995,6 @@ void __meminit memmap_init_zone(unsigned long size, int nid, unsigned long zone,
> * function. They do not exist on hotplugged memory.
> */
> if (context == MEMMAP_EARLY) {
> - if (!early_pfn_valid(pfn)) {
> - pfn = next_pfn(pfn);
> - continue;
> - }
> - if (!early_pfn_in_nid(pfn, nid)) {
> - pfn++;
> - continue;
> - }
This causes a compilation warning from Clang,
mm/page_alloc.c:5917:39: warning: unused function 'next_pfn' [-Wunused-function]
static inline __meminit unsigned long next_pfn(unsigned long pfn)
This should fix it,
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index d469384c9ca7..b48336e20bdc 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5912,23 +5912,6 @@ overlap_memmap_init(unsigned long zone, unsigned long *pfn)
return false;
}
-#ifdef CONFIG_SPARSEMEM
-/* Skip PFNs that belong to non-present sections */
-static inline __meminit unsigned long next_pfn(unsigned long pfn)
-{
- const unsigned long section_nr = pfn_to_section_nr(++pfn);
-
- if (present_section_nr(section_nr))
- return pfn;
- return section_nr_to_pfn(next_present_section_nr(section_nr));
-}
-#else
-static inline __meminit unsigned long next_pfn(unsigned long pfn)
-{
- return pfn++;
-}
-#endif
-
/*
* Initially all pages are reserved - free ones are freed
* up by memblock_free_all() once the early boot process is
> if (overlap_memmap_init(zone, &pfn))
> continue;
> if (defer_init(nid, pfn, end_pfn))
> @@ -6118,9 +6110,23 @@ static void __meminit zone_init_free_lists(struct zone *zone)
> }
>
> void __meminit __weak memmap_init(unsigned long size, int nid,
> - unsigned long zone, unsigned long start_pfn)
> + unsigned long zone,
> + unsigned long range_start_pfn)
> {
> - memmap_init_zone(size, nid, zone, start_pfn, MEMMAP_EARLY, NULL);
> + unsigned long start_pfn, end_pfn;
> + unsigned long range_end_pfn = range_start_pfn + size;
> + int i;
> +
> + for_each_mem_pfn_range(i, nid, &start_pfn, &end_pfn, NULL) {
> + start_pfn = clamp(start_pfn, range_start_pfn, range_end_pfn);
> + end_pfn = clamp(end_pfn, range_start_pfn, range_end_pfn);
> +
> + if (end_pfn > start_pfn) {
> + size = end_pfn - start_pfn;
> + memmap_init_zone(size, nid, zone, start_pfn,
> + MEMMAP_EARLY, NULL);
> + }
> + }
> }
>
> static int zone_batchsize(struct zone *zone)
> --
> 2.25.1
>
>
next prev parent reply other threads:[~2020-04-20 14:26 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-12 19:48 [PATCH 00/21] mm: rework free_area_init*() funcitons Mike Rapoport
2020-04-12 19:48 ` [PATCH 01/21] mm: memblock: replace dereferences of memblock_region.nid with API calls Mike Rapoport
2020-04-21 2:06 ` Baoquan He
2020-04-12 19:48 ` [PATCH 02/21] mm: make early_pfn_to_nid() and related defintions close to each other Mike Rapoport
2020-04-21 2:24 ` Baoquan He
2020-04-21 8:49 ` Mike Rapoport
2020-04-21 9:33 ` Baoquan He
2020-04-21 3:31 ` Baoquan He
2020-04-21 8:39 ` Mike Rapoport
2020-04-12 19:48 ` [PATCH 03/21] mm: remove CONFIG_HAVE_MEMBLOCK_NODE_MAP option Mike Rapoport
2020-04-21 4:23 ` Baoquan He
2020-04-21 9:09 ` Mike Rapoport
2020-04-21 9:45 ` Baoquan He
2020-04-12 19:48 ` [PATCH 04/21] mm: free_area_init: use maximal zone PFNs rather than zone sizes Mike Rapoport
2020-04-22 23:41 ` Baoquan He
2020-06-15 3:53 ` Greg Ungerer
2020-06-15 6:22 ` Mike Rapoport
2020-06-15 7:17 ` Greg Ungerer
2020-06-15 8:29 ` Mike Rapoport
2020-06-15 13:02 ` Greg Ungerer
2020-04-12 19:48 ` [PATCH 05/21] mm: use free_area_init() instead of free_area_init_nodes() Mike Rapoport
2020-04-23 0:02 ` Baoquan He
2020-04-12 19:48 ` [PATCH 06/21] alpha: simplify detection of memory zone boundaries Mike Rapoport
2020-04-12 19:48 ` [PATCH 07/21] arm: " Mike Rapoport
2020-04-12 19:48 ` [PATCH 08/21] arm64: simplify detection of memory zone boundaries for UMA configs Mike Rapoport
2020-04-12 19:48 ` [PATCH 09/21] csky: simplify detection of memory zone boundaries Mike Rapoport
2020-04-12 19:48 ` [PATCH 10/21] m68k: mm: " Mike Rapoport
2020-04-12 19:48 ` [PATCH 11/21] parisc: " Mike Rapoport
2020-04-12 19:48 ` [PATCH 12/21] sparc32: " Mike Rapoport
2020-04-12 19:48 ` [PATCH 13/21] unicore32: " Mike Rapoport
2020-04-12 19:48 ` [PATCH 14/21] xtensa: " Mike Rapoport
2020-04-12 19:48 ` [PATCH 15/21] mm: memmap_init: iterate over memblock regions rather that check each PFN Mike Rapoport
2020-04-20 14:26 ` Qian Cai [this message]
2020-04-24 7:22 ` David Hildenbrand
2020-04-25 16:49 ` Mike Rapoport
2020-04-12 19:48 ` [PATCH 16/21] mm: remove early_pfn_in_nid() and CONFIG_NODES_SPAN_OTHER_NODES Mike Rapoport
2020-04-23 1:13 ` Baoquan He
2020-04-23 5:50 ` Mike Rapoport
2020-05-18 21:38 ` Hoan Tran
2020-04-12 19:48 ` [PATCH 17/21] mm: free_area_init: allow defining max_zone_pfn in descending order Mike Rapoport
2020-04-23 2:53 ` Baoquan He
2020-04-23 2:57 ` Baoquan He
2020-04-23 5:55 ` Mike Rapoport
2020-04-24 0:33 ` Baoquan He
2020-04-12 19:48 ` [PATCH 18/21] mm: rename free_area_init_node() to free_area_init_memoryless_node() Mike Rapoport
2020-04-23 3:14 ` Baoquan He
2020-04-23 6:18 ` Mike Rapoport
2020-04-12 19:48 ` [PATCH 19/21] mm: clean up free_area_init_node() and its helpers Mike Rapoport
2020-04-12 19:48 ` [PATCH 20/21] mm: simplify find_min_pfn_with_active_regions() Mike Rapoport
2020-04-12 19:48 ` [PATCH 21/21] docs/vm: update memory-models documentation Mike Rapoport
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=CF6E407F-17DC-427C-8203-21979FB882EF@lca.pw \
--to=cai@lca.pw \
--cc=Hoan@os.amperecomputing.com \
--cc=James.Bottomley@HansenPartnership.com \
--cc=akpm@linux-foundation.org \
--cc=bcain@codeaurora.org \
--cc=bhe@redhat.com \
--cc=catalin.marinas@arm.com \
--cc=corbet@lwn.net \
--cc=dalias@libc.org \
--cc=davem@davemloft.net \
--cc=deller@gmx.de \
--cc=geert@linux-m68k.org \
--cc=gerg@linux-m68k.org \
--cc=green.hu@gmail.com \
--cc=guoren@kernel.org \
--cc=gxt@pku.edu.cn \
--cc=heiko.carstens@de.ibm.com \
--cc=jcmvbkbc@gmail.com \
--cc=ley.foon.tan@intel.com \
--cc=linux-alpha@vger.kernel.org \
--cc=linux-arch@vger.kernel.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-c6x-dev@linux-c6x.org \
--cc=linux-csky@vger.kernel.org \
--cc=linux-doc@vger.kernel.org \
--cc=linux-hexagon@vger.kernel.org \
--cc=linux-ia64@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-m68k@lists.linux-m68k.org \
--cc=linux-mips@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=linux-parisc@vger.kernel.org \
--cc=linux-riscv@lists.infradead.org \
--cc=linux-s390@vger.kernel.org \
--cc=linux-sh@vger.kernel.org \
--cc=linux-snps-arc@lists.infradead.org \
--cc=linux-um@lists.infradead.org \
--cc=linux-xtensa@linux-xtensa.org \
--cc=linux@armlinux.org.uk \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=mattst88@gmail.com \
--cc=mhocko@kernel.org \
--cc=monstr@monstr.eu \
--cc=mpe@ellerman.id.au \
--cc=msalter@redhat.com \
--cc=nickhu@andestech.com \
--cc=openrisc@lists.librecores.org \
--cc=paul.walmsley@sifive.com \
--cc=richard@nod.at \
--cc=rppt@kernel.org \
--cc=rppt@linux.ibm.com \
--cc=shorne@gmail.com \
--cc=sparclinux@vger.kernel.org \
--cc=tony.luck@intel.com \
--cc=tsbogend@alpha.franken.de \
--cc=uclinux-h8-devel@lists.sourceforge.jp \
--cc=vgupta@synopsys.com \
--cc=x86@kernel.org \
--cc=ysato@users.sourceforge.jp \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).