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mm: sparse: pass section_nr to section_mark_present

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Patch series "mm: sparse: remove __section_nr() function", v4.

This patch (of 3):

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.

Link: https://lkml.kernel.org/r/20210707150212.855-1-ohoono.kwon@samsung.com
Link: https://lkml.kernel.org/r/20210707150212.855-2-ohoono.kwon@samsung.com
Signed-off-by: Ohhoon Kwon <ohoono.kwon@samsung.com>
Acked-by: Mike Rapoport <rppt@linux.ibm.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: Baoquan He <bhe@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Ohhoon Kwon 2021-09-02 14:56:58 -07:00 committed by Linus Torvalds
parent cdcfc631c8
commit a1bc561bb2
1 changed files with 4 additions and 5 deletions
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9
mm/sparse.c
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@ -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)