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Date: Tue, 5 Mar 2013 20:58:46 +0100
From: Sam Ravnborg <sam@...nborg.org>
To: Jiang Liu <liuj97@...il.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
David Rientjes <rientjes@...gle.com>,
Jiang Liu <jiang.liu@...wei.com>,
Wen Congyang <wency@...fujitsu.com>,
Maciej Rutecki <maciej.rutecki@...il.com>,
Chris Clayton <chris2553@...glemail.com>,
"Rafael J . Wysocki" <rjw@...k.pl>, Mel Gorman <mgorman@...e.de>,
Minchan Kim <minchan@...nel.org>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
Michal Hocko <mhocko@...e.cz>,
Jianguo Wu <wujianguo@...wei.com>, linux-mm@...ck.org,
linux-kernel@...r.kernel.org,
"David S. Miller" <davem@...emloft.net>
Subject: Re: [RFC PATCH v1 22/33] mm/SPARC: use common help functions to
free reserved pages
On Tue, Mar 05, 2013 at 10:55:05PM +0800, Jiang Liu wrote:
> Use common help functions to free reserved pages.
I like how this simplify things!
Please consider how you can also cover the HIGHMEM case,
so map_high_region(...) is simplified too (in init_32.c).
>
> Signed-off-by: Jiang Liu <jiang.liu@...wei.com>
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: Sam Ravnborg <sam@...nborg.org>
> ---
> arch/sparc/kernel/leon_smp.c | 15 +++------------
> arch/sparc/mm/init_32.c | 40 ++++++----------------------------------
> arch/sparc/mm/init_64.c | 25 ++++---------------------
> 3 files changed, 13 insertions(+), 67 deletions(-)
>
> diff --git a/arch/sparc/mm/init_32.c b/arch/sparc/mm/init_32.c
> index 48e0c03..2a7b6eb 100644
> --- a/arch/sparc/mm/init_32.c
> +++ b/arch/sparc/mm/init_32.c
> @@ -374,45 +374,17 @@ void __init mem_init(void)
>
> void free_initmem (void)
> {
> - unsigned long addr;
> - unsigned long freed;
> -
> - addr = (unsigned long)(&__init_begin);
> - freed = (unsigned long)(&__init_end) - addr;
> - for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
> - struct page *p;
> -
> - memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
> - p = virt_to_page(addr);
> -
> - ClearPageReserved(p);
> - init_page_count(p);
> - __free_page(p);
> - totalram_pages++;
> - num_physpages++;
> - }
> - printk(KERN_INFO "Freeing unused kernel memory: %ldk freed\n",
> - freed >> 10);
> + num_physpages += free_reserved_area((unsigned long)(&__init_begin),
> + (unsigned long)(&__init_end),
> + POISON_FREE_INITMEM,
> + "unused kernel");
If you change free_initmem_default(...) to return number of pages freed this
could have been used here.
> }
>
> #ifdef CONFIG_BLK_DEV_INITRD
> void free_initrd_mem(unsigned long start, unsigned long end)
> {
> - if (start < end)
> - printk(KERN_INFO "Freeing initrd memory: %ldk freed\n",
> - (end - start) >> 10);
> - for (; start < end; start += PAGE_SIZE) {
> - struct page *p;
> -
> - memset((void *)start, POISON_FREE_INITMEM, PAGE_SIZE);
> - p = virt_to_page(start);
> -
> - ClearPageReserved(p);
> - init_page_count(p);
> - __free_page(p);
> - totalram_pages++;
> - num_physpages++;
> - }
> + num_physpages += free_reserved_area(start, end, POISON_FREE_INITMEM,
> + "initrd");
> }
> #endif
>
> diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c
> index 1588d33..03bfd10 100644
> --- a/arch/sparc/mm/init_64.c
> +++ b/arch/sparc/mm/init_64.c
> @@ -2060,8 +2060,7 @@ void __init mem_init(void)
> /* We subtract one to account for the mem_map_zero page
> * allocated below.
> */
> - totalram_pages -= 1;
> - num_physpages = totalram_pages;
> + num_physpages = totalram_pages - 1;
>
> /*
> * Set up the zero page, mark it reserved, so that page count
> @@ -2072,7 +2071,7 @@ void __init mem_init(void)
> prom_printf("paging_init: Cannot alloc zero page.\n");
> prom_halt();
> }
> - SetPageReserved(mem_map_zero);
> + mark_page_reserved(mem_map_zero);
>
> codepages = (((unsigned long) _etext) - ((unsigned long) _start));
> codepages = PAGE_ALIGN(codepages) >> PAGE_SHIFT;
> @@ -2112,7 +2111,6 @@ void free_initmem(void)
> initend = (unsigned long)(__init_end) & PAGE_MASK;
> for (; addr < initend; addr += PAGE_SIZE) {
> unsigned long page;
> - struct page *p;
>
> page = (addr +
> ((unsigned long) __va(kern_base)) -
> @@ -2120,13 +2118,8 @@ void free_initmem(void)
> memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
>
> if (do_free) {
> - p = virt_to_page(page);
> -
> - ClearPageReserved(p);
> - init_page_count(p);
> - __free_page(p);
> + free_reserved_page(virt_to_page(page));
> num_physpages++;
> - totalram_pages++;
> }
> }
> }
> @@ -2134,17 +2127,7 @@ void free_initmem(void)
> #ifdef CONFIG_BLK_DEV_INITRD
> void free_initrd_mem(unsigned long start, unsigned long end)
> {
> - if (start < end)
> - printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
> - for (; start < end; start += PAGE_SIZE) {
> - struct page *p = virt_to_page(start);
> -
> - ClearPageReserved(p);
> - init_page_count(p);
> - __free_page(p);
> - num_physpages++;
> - totalram_pages++;
> - }
> + num_physpages += free_reserved_area(start, end, 0, "initrd");
Please add poison POISON_FREE_INITMEM here. I know this was not done before.
Sam
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