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From: Ohhoon Kwon <ohoono.kwon@samsung.com>
To: david@redhat.com, ohoono.kwon@samsung.com,
	akpm@linux-foundation.org, mhocko@suse.com
Cc: bhe@redhat.com, rppt@linux.ibm.com, ohkwon1043@gmail.com,
	linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: [PATCH v3 1/1] mm: sparse: pass section_nr to section_mark_present
Date: Wed,  7 Jul 2021 22:14:43 +0900	[thread overview]
Message-ID: <20210707131443.6242-2-ohoono.kwon@samsung.com> (raw)
In-Reply-To: <20210707131443.6242-1-ohoono.kwon@samsung.com>

With CONFIG_SPARSEMEM_EXTREME enabled, __section_nr() which converts
mem_section to section_nr could be costly since it iterates all
section roots to check if the given mem_section is in its range.

Since both callers of section_mark_present already know section_nr,
let's also pass section_nr as well as mem_section in order to reduce
costly translation.

Signed-off-by: Ohhoon Kwon <ohoono.kwon@samsung.com>
Acked-by: Mike Rapoport <rppt@linux.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
---
 mm/sparse.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/mm/sparse.c b/mm/sparse.c
index 6326cdf36c4f..8018ee7fcda5 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -187,10 +187,9 @@ void __meminit mminit_validate_memmodel_limits(unsigned long *start_pfn,
  * those loops early.
  */
 unsigned long __highest_present_section_nr;
-static void section_mark_present(struct mem_section *ms)
+static void __section_mark_present(struct mem_section *ms,
+		unsigned long section_nr)
 {
-	unsigned long section_nr = __section_nr(ms);
-
 	if (section_nr > __highest_present_section_nr)
 		__highest_present_section_nr = section_nr;
 
@@ -280,7 +279,7 @@ static void __init memory_present(int nid, unsigned long start, unsigned long en
 		if (!ms->section_mem_map) {
 			ms->section_mem_map = sparse_encode_early_nid(nid) |
 							SECTION_IS_ONLINE;
-			section_mark_present(ms);
+			__section_mark_present(ms, section);
 		}
 	}
 }
@@ -934,7 +933,7 @@ int __meminit sparse_add_section(int nid, unsigned long start_pfn,
 
 	ms = __nr_to_section(section_nr);
 	set_section_nid(section_nr, nid);
-	section_mark_present(ms);
+	__section_mark_present(ms, section_nr);
 
 	/* Align memmap to section boundary in the subsection case */
 	if (section_nr_to_pfn(section_nr) != start_pfn)
-- 
2.17.1


  parent reply	other threads:[~2021-07-07 13:18 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CGME20210707131841epcas1p2697afbb9f3e6e8040cb12f2f867329db@epcas1p2.samsung.com>
2021-07-07 13:14 ` [PATCH v3 0/1] " Ohhoon Kwon
     [not found]   ` <CGME20210707131841epcas1p129d1c10efdbbe403e80f45245b0b5afd@epcas1p1.samsung.com>
2021-07-07 13:14     ` Ohhoon Kwon [this message]
2021-07-07 14:32       ` ***UNCHECKED*** [PATCH v3 1/1] " Michal Hocko

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