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Date:   Tue, 4 Dec 2018 23:44:04 +0000
From:   Wei Yang <richard.weiyang@gmail.com>
To:     Oscar Salvador <osalvador@suse.de>
Cc:     akpm@linux-foundation.org, mhocko@suse.com,
        pavel.tatashin@microsoft.com, vbabka@suse.cz,
        alexander.h.duyck@linux.intel.com, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH] mm, page_alloc: Drop uneeded __meminit and __meminitdata
Message-ID: <20181204234404.smwel3txywvntjpd@master>
Reply-To: Wei Yang <richard.weiyang@gmail.com>
References: <20181204111507.4808-1-osalvador@suse.de>
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On Tue, Dec 04, 2018 at 12:15:07PM +0100, Oscar Salvador wrote:
>Since commit 03e85f9d5f1 ("mm/page_alloc: Introduce free_area_init_core_hotplug"),
>some functions changed to only be called during system initialization.
>In concret, free_area_init_node and and the functions that hang from it.
>
>Also, some variables are no longer used after the system has gone
>through initialization.
>So this could be considered as a late clean-up for that patch.
>
>This patch changes the functions from __meminit to __init, and
>the variables from __meminitdata to __initdata.
>
>In return, we get some KBs back:
>
>Before:
>Freeing unused kernel image memory: 2472K
>
>After:
>Freeing unused kernel image memory: 2480K
>
>Signed-off-by: Oscar Salvador <osalvador@suse.de>

I like this one.

Reviewed-by: Wei Yang <richard.weiyang@gmail.com>

>---
> mm/page_alloc.c | 28 ++++++++++++++--------------
> 1 file changed, 14 insertions(+), 14 deletions(-)
>
>diff --git a/mm/page_alloc.c b/mm/page_alloc.c
>index fee5e9bad0dd..94e16eba162c 100644
>--- a/mm/page_alloc.c
>+++ b/mm/page_alloc.c
>@@ -266,18 +266,18 @@ int watermark_boost_factor __read_mostly = 15000;
> int watermark_scale_factor = 10;
> int fragment_stall_order __read_mostly = (PAGE_ALLOC_COSTLY_ORDER + 1);
> 
>-static unsigned long nr_kernel_pages __meminitdata;
>-static unsigned long nr_all_pages __meminitdata;
>-static unsigned long dma_reserve __meminitdata;
>+static unsigned long nr_kernel_pages __initdata;
>+static unsigned long nr_all_pages __initdata;
>+static unsigned long dma_reserve __initdata;
> 
> #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
>-static unsigned long arch_zone_lowest_possible_pfn[MAX_NR_ZONES] __meminitdata;
>-static unsigned long arch_zone_highest_possible_pfn[MAX_NR_ZONES] __meminitdata;
>+static unsigned long arch_zone_lowest_possible_pfn[MAX_NR_ZONES] __initdata;
>+static unsigned long arch_zone_highest_possible_pfn[MAX_NR_ZONES] __initdata;
> static unsigned long required_kernelcore __initdata;
> static unsigned long required_kernelcore_percent __initdata;
> static unsigned long required_movablecore __initdata;
> static unsigned long required_movablecore_percent __initdata;
>-static unsigned long zone_movable_pfn[MAX_NUMNODES] __meminitdata;
>+static unsigned long zone_movable_pfn[MAX_NUMNODES] __initdata;
> static bool mirrored_kernelcore __meminitdata;
> 
> /* movable_zone is the "real" zone pages in ZONE_MOVABLE are taken from */
>@@ -6211,7 +6211,7 @@ void __init sparse_memory_present_with_active_regions(int nid)
>  * with no available memory, a warning is printed and the start and end
>  * PFNs will be 0.
>  */
>-void __meminit get_pfn_range_for_nid(unsigned int nid,
>+void __init get_pfn_range_for_nid(unsigned int nid,
> 			unsigned long *start_pfn, unsigned long *end_pfn)
> {
> 	unsigned long this_start_pfn, this_end_pfn;
>@@ -6260,7 +6260,7 @@ static void __init find_usable_zone_for_movable(void)
>  * highest usable zone for ZONE_MOVABLE. This preserves the assumption that
>  * zones within a node are in order of monotonic increases memory addresses
>  */
>-static void __meminit adjust_zone_range_for_zone_movable(int nid,
>+static void __init adjust_zone_range_for_zone_movable(int nid,
> 					unsigned long zone_type,
> 					unsigned long node_start_pfn,
> 					unsigned long node_end_pfn,
>@@ -6291,7 +6291,7 @@ static void __meminit adjust_zone_range_for_zone_movable(int nid,
>  * Return the number of pages a zone spans in a node, including holes
>  * present_pages = zone_spanned_pages_in_node() - zone_absent_pages_in_node()
>  */
>-static unsigned long __meminit zone_spanned_pages_in_node(int nid,
>+static unsigned long __init zone_spanned_pages_in_node(int nid,
> 					unsigned long zone_type,
> 					unsigned long node_start_pfn,
> 					unsigned long node_end_pfn,
>@@ -6326,7 +6326,7 @@ static unsigned long __meminit zone_spanned_pages_in_node(int nid,
>  * Return the number of holes in a range on a node. If nid is MAX_NUMNODES,
>  * then all holes in the requested range will be accounted for.
>  */
>-unsigned long __meminit __absent_pages_in_range(int nid,
>+unsigned long __init __absent_pages_in_range(int nid,
> 				unsigned long range_start_pfn,
> 				unsigned long range_end_pfn)
> {
>@@ -6356,7 +6356,7 @@ unsigned long __init absent_pages_in_range(unsigned long start_pfn,
> }
> 
> /* Return the number of page frames in holes in a zone on a node */
>-static unsigned long __meminit zone_absent_pages_in_node(int nid,
>+static unsigned long __init zone_absent_pages_in_node(int nid,
> 					unsigned long zone_type,
> 					unsigned long node_start_pfn,
> 					unsigned long node_end_pfn,
>@@ -6408,7 +6408,7 @@ static unsigned long __meminit zone_absent_pages_in_node(int nid,
> }
> 
> #else /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
>-static inline unsigned long __meminit zone_spanned_pages_in_node(int nid,
>+static inline unsigned long __init zone_spanned_pages_in_node(int nid,
> 					unsigned long zone_type,
> 					unsigned long node_start_pfn,
> 					unsigned long node_end_pfn,
>@@ -6427,7 +6427,7 @@ static inline unsigned long __meminit zone_spanned_pages_in_node(int nid,
> 	return zones_size[zone_type];
> }
> 
>-static inline unsigned long __meminit zone_absent_pages_in_node(int nid,
>+static inline unsigned long __init zone_absent_pages_in_node(int nid,
> 						unsigned long zone_type,
> 						unsigned long node_start_pfn,
> 						unsigned long node_end_pfn,
>@@ -6441,7 +6441,7 @@ static inline unsigned long __meminit zone_absent_pages_in_node(int nid,
> 
> #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
> 
>-static void __meminit calculate_node_totalpages(struct pglist_data *pgdat,
>+static void __init calculate_node_totalpages(struct pglist_data *pgdat,
> 						unsigned long node_start_pfn,
> 						unsigned long node_end_pfn,
> 						unsigned long *zones_size,
>-- 
>2.13.7

-- 
Wei Yang
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