Messages in this thread | | | Subject | Re: [PATCH 13/35] x86, lmb: Add lmb_free_memory_size() | From | Benjamin Herrenschmidt <> | Date | Fri, 14 May 2010 12:31:25 +1000 |
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On Thu, 2010-05-13 at 17:19 -0700, Yinghai Lu wrote: > It will return free memory size in specified range. > > We can not use memory_size - reserved_size here, because some reserved area > may not be in the scope of lmb.memory.region. > > Use lmb.memory.region subtracting lmb.reserved.region to get free range array. > then count size of all free ranges.
I remember having already told you that the naming sucks.
Also, you fail to explain what this is actually needed for.
Cheers, Ben.
> Signed-off-by: Yinghai Lu <yinghai@kernel.org> > --- > arch/x86/include/asm/lmb.h | 1 + > arch/x86/mm/lmb.c | 51 ++++++++++++++++++++++++++++++++++++++++++++ > 2 files changed, 52 insertions(+), 0 deletions(-) > > diff --git a/arch/x86/include/asm/lmb.h b/arch/x86/include/asm/lmb.h > index 358d8a6..4fb94b5 100644 > --- a/arch/x86/include/asm/lmb.h > +++ b/arch/x86/include/asm/lmb.h > @@ -16,5 +16,6 @@ void lmb_register_active_regions(int nid, unsigned long start_pfn, > unsigned long last_pfn); > u64 lmb_hole_size(u64 start, u64 end); > u64 lmb_find_area_node(int nid, u64 start, u64 end, u64 size, u64 align); > +u64 lmb_free_memory_size(u64 addr, u64 limit); > > #endif > diff --git a/arch/x86/mm/lmb.c b/arch/x86/mm/lmb.c > index c5fa1dd..6c69e99 100644 > --- a/arch/x86/mm/lmb.c > +++ b/arch/x86/mm/lmb.c > @@ -226,6 +226,57 @@ void __init lmb_to_bootmem(u64 start, u64 end) > } > #endif > > +u64 __init lmb_free_memory_size(u64 addr, u64 limit) > +{ > + int i, count; > + struct range *range; > + int nr_range; > + u64 final_start, final_end; > + u64 free_size; > + > + count = (lmb.reserved.cnt + lmb.memory.cnt) * 2; > + > + range = find_range_array(count); > + nr_range = 0; > + > + addr = PFN_UP(addr); > + limit = PFN_DOWN(limit); > + > + for (i = 0; i < lmb.memory.cnt; i++) { > + struct lmb_region *r = &lmb.memory.regions[i]; > + > + final_start = PFN_UP(r->base); > + final_end = PFN_DOWN(r->base + r->size); > + if (final_start >= final_end) > + continue; > + if (final_start >= limit || final_end <= addr) > + continue; > + > + nr_range = add_range(range, count, nr_range, final_start, final_end); > + } > + subtract_range(range, count, 0, addr); > + subtract_range(range, count, limit, -1ULL); > + for (i = 0; i < lmb.reserved.cnt; i++) { > + struct lmb_region *r = &lmb.reserved.regions[i]; > + > + final_start = PFN_DOWN(r->base); > + final_end = PFN_UP(r->base + r->size); > + if (final_start >= final_end) > + continue; > + if (final_start >= limit || final_end <= addr) > + continue; > + > + subtract_range(range, count, final_start, final_end); > + } > + nr_range = clean_sort_range(range, count); > + > + free_size = 0; > + for (i = 0; i < nr_range; i++) > + free_size += range[i].end - range[i].start; > + > + return free_size << PAGE_SHIFT; > +} > + > void __init lmb_add_memory(u64 start, u64 end) > { > lmb_add_region(&lmb.memory, start, end - start);
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