Commit 07a34a8c authored by Baoquan He's avatar Baoquan He Committed by Linus Torvalds

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.comSigned-off-by: default avatarBaoquan He <bhe@redhat.com>
Acked-by: default avatarDave Hansen <dave.hansen@intel.com>
Reviewed-by: default avatarPavel Tatashin <pasha.tatashin@oracle.com>
Reviewed-by: default avatarOscar 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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent f2fc10e0
...@@ -292,18 +292,14 @@ void __init sparse_mem_maps_populate_node(struct page **map_map, ...@@ -292,18 +292,14 @@ void __init sparse_mem_maps_populate_node(struct page **map_map,
} }
for (pnum = pnum_begin; pnum < pnum_end; pnum++) { for (pnum = pnum_begin; pnum < pnum_end; pnum++) {
struct mem_section *ms;
if (!present_section_nr(pnum)) if (!present_section_nr(pnum))
continue; continue;
map_map[pnum] = sparse_mem_map_populate(pnum, nodeid, NULL); map_map[pnum] = sparse_mem_map_populate(pnum, nodeid, NULL);
if (map_map[pnum]) if (map_map[pnum])
continue; continue;
ms = __nr_to_section(pnum);
pr_err("%s: sparsemem memory map backing failed some memory will not be available\n", pr_err("%s: sparsemem memory map backing failed some memory will not be available\n",
__func__); __func__);
ms->section_mem_map = 0;
} }
if (vmemmap_buf_start) { if (vmemmap_buf_start) {
......
...@@ -446,7 +446,6 @@ void __init sparse_mem_maps_populate_node(struct page **map_map, ...@@ -446,7 +446,6 @@ void __init sparse_mem_maps_populate_node(struct page **map_map,
ms = __nr_to_section(pnum); ms = __nr_to_section(pnum);
pr_err("%s: sparsemem memory map backing failed some memory will not be available\n", pr_err("%s: sparsemem memory map backing failed some memory will not be available\n",
__func__); __func__);
ms->section_mem_map = 0;
} }
} }
#endif /* !CONFIG_SPARSEMEM_VMEMMAP */ #endif /* !CONFIG_SPARSEMEM_VMEMMAP */
...@@ -474,7 +473,6 @@ static struct page __init *sparse_early_mem_map_alloc(unsigned long pnum) ...@@ -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", pr_err("%s: sparsemem memory map backing failed some memory will not be available\n",
__func__); __func__);
ms->section_mem_map = 0;
return NULL; return NULL;
} }
#endif #endif
...@@ -578,17 +576,23 @@ void __init sparse_init(void) ...@@ -578,17 +576,23 @@ void __init sparse_init(void)
#endif #endif
for_each_present_section_nr(0, pnum) { for_each_present_section_nr(0, pnum) {
struct mem_section *ms;
ms = __nr_to_section(pnum);
usemap = usemap_map[pnum]; usemap = usemap_map[pnum];
if (!usemap) if (!usemap) {
ms->section_mem_map = 0;
continue; continue;
}
#ifdef CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER #ifdef CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER
map = map_map[pnum]; map = map_map[pnum];
#else #else
map = sparse_early_mem_map_alloc(pnum); map = sparse_early_mem_map_alloc(pnum);
#endif #endif
if (!map) if (!map) {
ms->section_mem_map = 0;
continue; continue;
}
sparse_init_one_section(__nr_to_section(pnum), pnum, map, sparse_init_one_section(__nr_to_section(pnum), pnum, map,
usemap); usemap);
......
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