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[POWERPC] pseries: phyp dump: Tracking memory range freed

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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: Manish Ahuja <mahuja@us.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Manish Ahuja 2008-03-22 10:47:04 +11:00 committed by Paul Mackerras
parent a9c508dae1
commit fd35cff8d2
1 changed files with 35 additions and 0 deletions
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35
arch/powerpc/platforms/pseries/phyp_dump.c
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@ -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)