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mm/sparsemem.c: defer the ms->section_mem_map clearing 

In sparse_init(), if CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER=y, system
will allocate one continuous memory chunk for mem maps on one node and
populate the relevant page tables to map memory section one by one.  If
fail to populate for a certain mem section, print warning and its
->section_mem_map will be cleared to cancel the marking of being
present.  Like this, the number of mem sections marked as present could
become less during sparse_init() execution.

Here just defer the ms->section_mem_map clearing if failed to populate
its page tables until the last for_each_present_section_nr() loop.  This
is in preparation for later optimizing the mem map allocation.

[akpm@linux-foundation.org: remove now-unused local `ms', per Oscar]
Link: http://lkml.kernel.org/r/20180228032657.32385-3-bhe@redhat.com
Signed-off-by: Baoquan He <bhe@redhat.com>
Acked-by: Dave Hansen <dave.hansen@intel.com>
Reviewed-by: Pavel Tatashin <pasha.tatashin@oracle.com>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Cc: Pasha Tatashin <Pavel.Tatashin@microsoft.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Pankaj Gupta <pagupta@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:
Baoquan He 2018-08-17 15:48:42 -07:00 committed by Linus Torvalds
parent f2fc10e0b3
commit 07a34a8c36
2 changed files with 8 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
mm/sparse-vmemmap.c
View File

@ -292,18 +292,14 @@ void __init sparse_mem_maps_populate_node(struct page **map_map,
}
for (pnum = pnum_begin; pnum < pnum_end; pnum++) {
struct mem_section *ms;
if (!present_section_nr(pnum))
continue;
map_map[pnum] = sparse_mem_map_populate(pnum, nodeid, NULL);
if (map_map[pnum])
continue;
ms = __nr_to_section(pnum);
pr_err("%s: sparsemem memory map backing failed some memory will not be available\n",
__func__);
ms->section_mem_map = 0;
}
if (vmemmap_buf_start) {

12
mm/sparse.c
View File

@ -446,7 +446,6 @@ void __init sparse_mem_maps_populate_node(struct page **map_map,
ms = __nr_to_section(pnum);
pr_err("%s: sparsemem memory map backing failed some memory will not be available\n",
__func__);
ms->section_mem_map = 0;
}
}
#endif /* !CONFIG_SPARSEMEM_VMEMMAP */
@ -474,7 +473,6 @@ static struct page __init *sparse_early_mem_map_alloc(unsigned long pnum)
pr_err("%s: sparsemem memory map backing failed some memory will not be available\n",
__func__);
ms->section_mem_map = 0;
return NULL;
}
#endif
@ -578,17 +576,23 @@ void __init sparse_init(void)
#endif
for_each_present_section_nr(0, pnum) {
struct mem_section *ms;
ms = __nr_to_section(pnum);
usemap = usemap_map[pnum];
if (!usemap)
if (!usemap) {
ms->section_mem_map = 0;
continue;
}
#ifdef CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER
map = map_map[pnum];
#else
map = sparse_early_mem_map_alloc(pnum);
#endif
if (!map)
if (!map) {
ms->section_mem_map = 0;
continue;
}
sparse_init_one_section(__nr_to_section(pnum), pnum, map,
usemap);