https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=242427
--- Comment #3 from Peter Eriksson <p...@lysator.liu.se> ---
(In reply to Mark Johnston from comment #1)
# sysctl vm.pmap
vm.pmap.pdpe.demotions: 3
vm.pmap.pde.promotions: 18422
vm.pmap.pde.p_failures: 1050
vm.pmap.pde.mappings: 11065
vm.pmap.pde.demotions: 1546
vm.pmap.allow_2m_x_ept: 1
vm.pmap.pcid_save_cnt: 2609830
vm.pmap.pti: 1
vm.pmap.invpcid_works: 1
vm.pmap.pcid_enabled: 1
vm.pmap.pg_ps_enabled: 1
vm.pmap.pat_works: 1
As for the questsions from Konstantin:
CPU: Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz (2100.04-MHz K8-class CPU)
FreeBSD/SMP: 2 package(s) x 8 core(s) x 2 hardware threads
hw.ncpu: 32
FreeBSD 11.3-RELEASE-p5
The measurements are very simple, one example from sys/vm/vm_kern.c
> extern int verbose_shutdown; /* sysctl kern.shutdown.verbose, defined
> elsewhere */
>
> void
> kmem_unback(vm_object_t object, vm_offset_t addr, vm_size_t size)
> {
> vm_page_t m, next;
> vm_offset_t end, offset;
> time_t t0;
> int dt;
>
> KASSERT(object == kmem_object || object == kernel_object,
> ("kmem_unback: only supports kernel objects."));
>
> if (verbose_shutdown > 3)
> t0 = time_second;
>
> pmap_remove(kernel_pmap, addr, addr + size);
>
> if (verbose_shutdown > 3) {
> dt = time_second - t0;
> if (dt > 0)
> printf("kmem_unback: pmap_remove(kernel_pmap, %lu, %lu) took %d
> seconds\n",
> (unsigned long) addr, (unsigned long) addr+size, dt);
> t0 = time_second;
> }
The printed messages when dt is 1 (or more, but that hasn't happened yet)
perfectly matches with the time spent (when measured "higher up" in the call
chain and measured by a wall clock).
(The resultion of time_second is seconds so probably should change to something
with a bit higher resolution if I'd really wanna know how long time
pmap_remove() takes)
I haven't tested an INVARIANTS build yet, but will do that...
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