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Commit fd35cff8 authored by Manish Ahuja's avatar Manish Ahuja Committed by Paul Mackerras
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[POWERPC] pseries: phyp dump: Tracking memory range freed 



This tracks the size freed.  For now it does a simple rudimentary
calculation of the ranges freed.  The idea is to keep it simple at the
external shell script level and send in large chunks for now.

Signed-off-by: default avatarManish Ahuja <mahuja@us.ibm.com>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
parent a9c508da

arch/powerpc/platforms/pseries/phyp_dump.c

+35 −0
Original line number Diff line number Diff line
@@ -261,6 +261,39 @@ static void release_memory_range(unsigned long start_pfn, 
	}

}



/**

 * track_freed_range -- Counts the range being freed.

 * Once the counter goes to zero, it re-registers dump for

 * future use.

 */

static void

track_freed_range(unsigned long addr, unsigned long length)

{

	static unsigned long scratch_area_size, reserved_area_size;



	if (addr < phyp_dump_info->init_reserve_start)

		return;



	if ((addr >= phyp_dump_info->init_reserve_start) &&

	    (addr <= phyp_dump_info->init_reserve_start +

	     phyp_dump_info->init_reserve_size))

		reserved_area_size += length;



	if ((addr >= phyp_dump_info->reserved_scratch_addr) &&

	    (addr <= phyp_dump_info->reserved_scratch_addr +

	     phyp_dump_info->reserved_scratch_size))

		scratch_area_size += length;



	if ((reserved_area_size == phyp_dump_info->init_reserve_size) &&

	    (scratch_area_size == phyp_dump_info->reserved_scratch_size)) {



		invalidate_last_dump(&phdr,

				phyp_dump_info->reserved_scratch_addr);

		register_dump_area(&phdr,

				phyp_dump_info->reserved_scratch_addr);

	}

}



/* ------------------------------------------------- */

/**

 * sysfs_release_region -- sysfs interface to release memory range.
@@ -285,6 +318,8 @@ static ssize_t store_release_region(struct kobject *kobj, 
	if (ret != 2)

		return -EINVAL;



	track_freed_range(start_addr, length);



	/* Range-check - don't free any reserved memory that

	 * wasn't reserved for phyp-dump */

	if (start_addr < phyp_dump_info->init_reserve_start)