The patch titled
Subject: mm: sparse: pass section_nr to section_mark_present
has been added to the -mm tree. Its filename is
mm-sparse-pass-section_nr-to-section_mark_present.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-sparse-pass-section_nr-to-section_mark_present.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-sparse-pass-section_nr-to-section_mark_present.patch
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------------------------------------------------------
From: Ohhoon Kwon <ohoono.kwon@xxxxxxxxxxx>
Subject: mm: sparse: pass section_nr to section_mark_present
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@xxxxxxxxxxx
Link: https://lkml.kernel.org/r/20210707150212.855-2-ohoono.kwon@xxxxxxxxxxx
Signed-off-by: Ohhoon Kwon <ohoono.kwon@xxxxxxxxxxx>
Acked-by: Mike Rapoport <rppt@xxxxxxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
Reviewed-by: David Hildenbrand <david@xxxxxxxxxx>
Cc: Baoquan He <bhe@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/sparse.c | 9 ++++-----
1 file changed, 4 insertions(+), 5 deletions(-)
--- a/mm/sparse.c~mm-sparse-pass-section_nr-to-section_mark_present
+++ a/mm/sparse.c
@@ -187,10 +187,9 @@ void __meminit mminit_validate_memmodel_
* 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 ni
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
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)
_
Patches currently in -mm which might be from ohoono.kwon@xxxxxxxxxxx are
mm-sparse-pass-section_nr-to-section_mark_present.patch
mm-sparse-pass-section_nr-to-find_memory_block.patch
mm-sparse-remove-__section_nr-function.patch
