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authorMel Gorman <mgorman@suse.de>2015-07-01 00:57:02 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2015-07-01 05:44:56 +0300
commit3a80a7fa7989fbb6aa56bb6ad31811b62cf99e60 (patch)
treecfcd9fb093f891b4218618d63347cfa63be7e38f /mm/internal.h
parent75a592a47129dcfc1aec40e7d3cdf239a767d441 (diff)
downloadlinux-3a80a7fa7989fbb6aa56bb6ad31811b62cf99e60.tar.xz
mm: meminit: initialise a subset of struct pages if CONFIG_DEFERRED_STRUCT_PAGE_INIT is set
This patch initalises all low memory struct pages and 2G of the highest zone on each node during memory initialisation if CONFIG_DEFERRED_STRUCT_PAGE_INIT is set. That config option cannot be set but will be available in a later patch. Parallel initialisation of struct page depends on some features from memory hotplug and it is necessary to alter alter section annotations. Signed-off-by: Mel Gorman <mgorman@suse.de> Tested-by: Nate Zimmer <nzimmer@sgi.com> Tested-by: Waiman Long <waiman.long@hp.com> Tested-by: Daniel J Blueman <daniel@numascale.com> Acked-by: Pekka Enberg <penberg@kernel.org> Cc: Robin Holt <robinmholt@gmail.com> Cc: Nate Zimmer <nzimmer@sgi.com> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Waiman Long <waiman.long@hp.com> Cc: Scott Norton <scott.norton@hp.com> Cc: "Luck, Tony" <tony.luck@intel.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/internal.h')
-rw-r--r--mm/internal.h18
1 files changed, 18 insertions, 0 deletions
diff --git a/mm/internal.h b/mm/internal.h
index 58e9022e3757..88ac7be741ca 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -387,6 +387,24 @@ static inline void mminit_verify_zonelist(void)
}
#endif /* CONFIG_DEBUG_MEMORY_INIT */
+/*
+ * Deferred struct page initialisation requires init functions that are freed
+ * before kswapd is available. Reuse the memory hotplug section annotation
+ * to mark the required code.
+ *
+ * __defermem_init is code that always exists but is annotated __meminit to
+ * avoid section warnings.
+ * __defer_init code gets marked __meminit when deferring struct page
+ * initialistion but is otherwise in the init section.
+ */
+#ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
+#define __defermem_init __meminit
+#define __defer_init __meminit
+#else
+#define __defermem_init
+#define __defer_init __init
+#endif
+
/* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */
#if defined(CONFIG_SPARSEMEM)
extern void mminit_validate_memmodel_limits(unsigned long *start_pfn,