diff options
| author | Mel Gorman <mgorman@suse.de> | 2015-07-01 00:56:55 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-07-01 05:44:56 +0300 |
| commit | 8a942fdea560d4ac0e9d9fabcd5201ad20e0c382 (patch) | |
| tree | 452c0f5acccf96ffc54748a44ab5bc788f7dbffc /include | |
| parent | d70ddd7a5d9aa335f9b4b0c3d879e1e70ee1e4e3 (diff) | |
| download | linux-8a942fdea560d4ac0e9d9fabcd5201ad20e0c382.tar.xz | |
mm: meminit: make __early_pfn_to_nid SMP-safe and introduce meminit_pfn_in_nid
__early_pfn_to_nid() use static variables to cache recent lookups as
memblock lookups are very expensive but it assumes that memory
initialisation is single-threaded. Parallel initialisation of struct
pages will break that assumption so this patch makes __early_pfn_to_nid()
SMP-safe by requiring the caller to cache recent search information.
early_pfn_to_nid() keeps the same interface but is only safe to use early
in boot due to the use of a global static variable. meminit_pfn_in_nid()
is an SMP-safe version that callers must maintain their own state for.
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 'include')
| -rw-r--r-- | include/linux/mm.h | 6 | ||||
| -rw-r--r-- | include/linux/mmzone.h | 16 |
2 files changed, 19 insertions, 3 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h index d662af2d0d01..2e872f92dbac 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1726,7 +1726,8 @@ extern void sparse_memory_present_with_active_regions(int nid); #if !defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) && \ !defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID) -static inline int __early_pfn_to_nid(unsigned long pfn) +static inline int __early_pfn_to_nid(unsigned long pfn, + struct mminit_pfnnid_cache *state) { return 0; } @@ -1734,7 +1735,8 @@ static inline int __early_pfn_to_nid(unsigned long pfn) /* please see mm/page_alloc.c */ extern int __meminit early_pfn_to_nid(unsigned long pfn); /* there is a per-arch backend function. */ -extern int __meminit __early_pfn_to_nid(unsigned long pfn); +extern int __meminit __early_pfn_to_nid(unsigned long pfn, + struct mminit_pfnnid_cache *state); #endif extern void set_dma_reserve(unsigned long new_dma_reserve); diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index 54d74f6eb233..b2473d822549 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -1216,10 +1216,24 @@ void sparse_init(void); #define sparse_index_init(_sec, _nid) do {} while (0) #endif /* CONFIG_SPARSEMEM */ +/* + * During memory init memblocks map pfns to nids. The search is expensive and + * this caches recent lookups. The implementation of __early_pfn_to_nid + * may treat start/end as pfns or sections. + */ +struct mminit_pfnnid_cache { + unsigned long last_start; + unsigned long last_end; + int last_nid; +}; + #ifdef CONFIG_NODES_SPAN_OTHER_NODES bool early_pfn_in_nid(unsigned long pfn, int nid); +bool meminit_pfn_in_nid(unsigned long pfn, int node, + struct mminit_pfnnid_cache *state); #else -#define early_pfn_in_nid(pfn, nid) (1) +#define early_pfn_in_nid(pfn, nid) (1) +#define meminit_pfn_in_nid(pfn, nid, state) (1) #endif #ifndef early_pfn_valid |