Displaying 1 result from an estimated 1 matches for "zone_hi".
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zoechi
2012 Oct 11
14
alloc_heap_pages is low efficient with more CPUs
...30s.
After studied it by printing log, I have located a place in the hypervisor where cost too much time,
occupied 98% of the whole starting time.
xen/common/page_alloc.c
/* Allocate 2^@order contiguous pages. */
static struct page_info *alloc_heap_pages(
unsigned int zone_lo, unsigned int zone_hi,
unsigned int node, unsigned int order, unsigned int memflags)
{
if ( pg[i].u.free.need_tlbflush )
{
/* Add in extra CPUs that need flushing because of this page. */
cpus_andnot(extra_cpus_mask, cpu_online_map, mask);
tlbflush_filter(extra_cpu...