arc_shrink.xd

#!/usr/sbin/dtrace -s

arc_shrink:entry
{
	stack();
}

arc_reclaim_needed:return
/arg1/
{
	stack();
	if (`needfree) {
		printf("needfree > 0");
	} else if (`freemem < `lotsfree + `needfree + `desfree) {
		printf("freemem < lotsfree + needfree + desfree");
		printf("%u < %u + %u + %u",
		    `freemem, `lotsfree, `needfree, `desfree);
	} else if (`availrmem < `swapfs_minfree + `swapfs_reserve + `desfree) {
		printf("availrmem < swapfs_minfree + swapfs_reserve + desfree");
		printf("%u < %u + %u + %u",
		    `availrmem, `swapfs_minfree, `swapfs_reserve, `desfree);
	} else if (`availrmem < `pages_pp_maximum) {
		printf("availrmem < pages_pp_maximum");
		printf("%u < %u",
		    `availrmem, `pages_pp_maximum);
	} else if (`zio_arena->vm_kstat.vk_mem_total.value.ui64 - 
	    `zio_arena->vm_kstat.vk_mem_inuse.value.ui64 <
	    `zio_arena->vm_kstat.vk_mem_inuse.value.ui64 << 4) {
		printf("zio_arena->FREE < zio_arena->ALLOC / 16");
		printf("%u < %u",
		    `zio_arena->vm_kstat.vk_mem_total.value.ui64 -
		    `zio_arena->vm_kstat.vk_mem_inuse.value.ui64,
		    `zio_arena->vm_kstat.vk_mem_inuse.value.ui64 << 4);
	} else {
		printf("unknown reason");
	}
}