On Wed, May 03, 2023, Peter Xu wrote:
> Mimic dirty log test to allow specify physical cpu pinning for vcpu threads.
>
> Signed-off-by: Peter Xu <peterx@xxxxxxxxxx>
> ---
> tools/testing/selftests/kvm/demand_paging_test.c | 15 +++++++++++++--
> 1 file changed, 13 insertions(+), 2 deletions(-)
>
> diff --git a/tools/testing/selftests/kvm/demand_paging_test.c b/tools/testing/selftests/kvm/demand_paging_test.c
> index bdb8e0748154..d709b65fda2f 100644
> --- a/tools/testing/selftests/kvm/demand_paging_test.c
> +++ b/tools/testing/selftests/kvm/demand_paging_test.c
> @@ -220,12 +220,13 @@ static void run_test(enum vm_guest_mode mode, void *arg)
> static void help(char *name)
> {
> puts("");
> - printf("usage: %s [-h] [-m vm_mode] [-u uffd_mode] [-a]\n"
> + printf("usage: %s [-h] [-m vm_mode] [-u uffd_mode] [-a] [-c cpu_list]\n"
> " [-d uffd_delay_usec] [-r readers_per_uffd] [-b memory]\n"
> " [-s type] [-v vcpus] [-o]\n", name);
> guest_modes_help();
> printf(" -u: use userfaultfd to handle vCPU page faults. Mode is a\n"
> " UFFD registration mode: 'MISSING' or 'MINOR'.\n");
> + printf(" -c: physical cores to pin vcpu threads (e.g. 1,2,3,...)\n");
This help really should be provided by kvm_util.c, e.g. this doesn't capture the
"must pin all vCPUs" behavior, nor does it capture the "pin the main thread"
behavior.
Something like this?
void kvm_get_vcpu_pinning_help(char *buffer, size_t size,
const char *optchar, const char *testname)
{
snprintf(buffer, size,
" -%c: Pin tasks to physical CPUs. Takes a list of comma separated\n"
" values (target pCPU), one for each vCPU, plus an optional\n"
" entry for the main application task (specified via entry\n"
" <nr_vcpus + 1>). If used, entries must be provided for all\n"
" vCPUs, i.e. pinning vCPUs is all or nothing.\n\n"
" E.g. to create 3 vCPUs, pin vCPU0=>pCPU22, vCPU1=>pCPU23,\n"
" vCPU2=>pCPU24, and pin the application task to pCPU50:\n\n"
" ./%s -v 3 -c 22,23,24,50\n\n"
" To leave the application task unpinned, drop the final entry:\n\n"
" ./%s -v 3 -c 22,23,24\n\n"
" (default: no pinning)\n", optchar, testname);
}
