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authorUsama Arif <usama.arif@bytedance.com>2023-09-13 13:54:00 +0300
committerAndrew Morton <akpm@linux-foundation.org>2023-10-04 20:32:30 +0300
commit77e6c43e137c130138c3fbadc847351a83c4befe (patch)
treed93ff3743c36fee1c6a060df4cfa1600f1de92d9 /include/linux/memblock.h
parentee8d2071ef52d83a2ac4f8a474fafb2aea91766d (diff)
downloadlinux-77e6c43e137c130138c3fbadc847351a83c4befe.tar.xz
memblock: introduce MEMBLOCK_RSRV_NOINIT flag
For reserved memory regions marked with this flag, reserve_bootmem_region is not called during memmap_init_reserved_pages. This can be used to avoid struct page initialization for regions which won't need them, for e.g. hugepages with Hugepage Vmemmap Optimization enabled. Link: https://lkml.kernel.org/r/20230913105401.519709-4-usama.arif@bytedance.com Signed-off-by: Usama Arif <usama.arif@bytedance.com> Acked-by: Muchun Song <songmuchun@bytedance.com> Reviewed-by: Mike Rapoport (IBM) <rppt@kernel.org> Cc: Fam Zheng <fam.zheng@bytedance.com> Cc: Mike Kravetz <mike.kravetz@oracle.com> Cc: Punit Agrawal <punit.agrawal@bytedance.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'include/linux/memblock.h')
-rw-r--r--include/linux/memblock.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/memblock.h b/include/linux/memblock.h
index 1c1072e3ca06..ae3bde302f70 100644
--- a/include/linux/memblock.h
+++ b/include/linux/memblock.h
@@ -40,6 +40,8 @@ extern unsigned long long max_possible_pfn;
* via a driver, and never indicated in the firmware-provided memory map as
* system RAM. This corresponds to IORESOURCE_SYSRAM_DRIVER_MANAGED in the
* kernel resource tree.
+ * @MEMBLOCK_RSRV_NOINIT: memory region for which struct pages are
+ * not initialized (only for reserved regions).
*/
enum memblock_flags {
MEMBLOCK_NONE = 0x0, /* No special request */
@@ -47,6 +49,7 @@ enum memblock_flags {
MEMBLOCK_MIRROR = 0x2, /* mirrored region */
MEMBLOCK_NOMAP = 0x4, /* don't add to kernel direct mapping */
MEMBLOCK_DRIVER_MANAGED = 0x8, /* always detected via a driver */
+ MEMBLOCK_RSRV_NOINIT = 0x10, /* don't initialize struct pages */
};
/**
@@ -125,6 +128,7 @@ int memblock_clear_hotplug(phys_addr_t base, phys_addr_t size);
int memblock_mark_mirror(phys_addr_t base, phys_addr_t size);
int memblock_mark_nomap(phys_addr_t base, phys_addr_t size);
int memblock_clear_nomap(phys_addr_t base, phys_addr_t size);
+int memblock_reserved_mark_noinit(phys_addr_t base, phys_addr_t size);
void memblock_free_all(void);
void memblock_free(void *ptr, size_t size);
@@ -259,6 +263,11 @@ static inline bool memblock_is_nomap(struct memblock_region *m)
return m->flags & MEMBLOCK_NOMAP;
}
+static inline bool memblock_is_reserved_noinit(struct memblock_region *m)
+{
+ return m->flags & MEMBLOCK_RSRV_NOINIT;
+}
+
static inline bool memblock_is_driver_managed(struct memblock_region *m)
{
return m->flags & MEMBLOCK_DRIVER_MANAGED;