On Thu, Jun 13, 2019 at 02:42:47PM -0700, 'Ira Weiny' wrote:
> On Thu, Jun 13, 2019 at 06:45:02PM +0800, Pingfan Liu wrote:
> > Introduce a GUP_LONGTERM_BENCHMARK ioctl to test longterm pin in gup fast
> > path.
> >
> > Signed-off-by: Pingfan Liu <kernelfans@xxxxxxxxx>
> > Cc: Ira Weiny <ira.weiny@xxxxxxxxx>
> > Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> > Cc: Mike Rapoport <rppt@xxxxxxxxxxxxx>
> > Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
> > Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
> > Cc: John Hubbard <jhubbard@xxxxxxxxxx>
> > Cc: "Aneesh Kumar K.V" <aneesh.kumar@xxxxxxxxxxxxx>
> > Cc: Keith Busch <keith.busch@xxxxxxxxx>
> > Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>
> > Cc: Shuah Khan <shuah@xxxxxxxxxx>
> > Cc: linux-kernel@xxxxxxxxxxxxxxx
> > ---
> > mm/gup_benchmark.c | 11 +++++++++--
> > tools/testing/selftests/vm/gup_benchmark.c | 10 +++++++---
> > 2 files changed, 16 insertions(+), 5 deletions(-)
> >
> > diff --git a/mm/gup_benchmark.c b/mm/gup_benchmark.c
> > index 7dd602d..83f3378 100644
> > --- a/mm/gup_benchmark.c
> > +++ b/mm/gup_benchmark.c
> > @@ -6,8 +6,9 @@
> > #include <linux/debugfs.h>
> >
> > #define GUP_FAST_BENCHMARK _IOWR('g', 1, struct gup_benchmark)
> > -#define GUP_LONGTERM_BENCHMARK _IOWR('g', 2, struct gup_benchmark)
> > -#define GUP_BENCHMARK _IOWR('g', 3, struct gup_benchmark)
> > +#define GUP_FAST_LONGTERM_BENCHMARK _IOWR('g', 2, struct gup_benchmark)
> > +#define GUP_LONGTERM_BENCHMARK _IOWR('g', 3, struct gup_benchmark)
> > +#define GUP_BENCHMARK _IOWR('g', 4, struct gup_benchmark)
>
> But I really like this addition! Thanks!
>
> But why not just add GUP_FAST_LONGTERM_BENCHMARK to the end of this list (value
> 4)? I know the user space test program is probably expected to be lock step
> with this code but it seems odd to redefine GUP_LONGTERM_BENCHMARK and
> GUP_BENCHMARK with this change.
I see that Andrew pull this change. So if others don't think this renumbering
is an issue feel free to add my:
Reviewed-by: Ira Weiny <ira.weiny@xxxxxxxxx>
>
> Ira
>
> >
> > struct gup_benchmark {
> > __u64 get_delta_usec;
> > @@ -53,6 +54,11 @@ static int __gup_benchmark_ioctl(unsigned int cmd,
> > nr = get_user_pages_fast(addr, nr, gup->flags & 1,
> > pages + i);
> > break;
> > + case GUP_FAST_LONGTERM_BENCHMARK:
> > + nr = get_user_pages_fast(addr, nr,
> > + (gup->flags & 1) | FOLL_LONGTERM,
> > + pages + i);
> > + break;
> > case GUP_LONGTERM_BENCHMARK:
> > nr = get_user_pages(addr, nr,
> > (gup->flags & 1) | FOLL_LONGTERM,
> > @@ -96,6 +102,7 @@ static long gup_benchmark_ioctl(struct file *filep, unsigned int cmd,
> >
> > switch (cmd) {
> > case GUP_FAST_BENCHMARK:
> > + case GUP_FAST_LONGTERM_BENCHMARK:
> > case GUP_LONGTERM_BENCHMARK:
> > case GUP_BENCHMARK:
> > break;
> > diff --git a/tools/testing/selftests/vm/gup_benchmark.c b/tools/testing/selftests/vm/gup_benchmark.c
> > index c0534e2..ade8acb 100644
> > --- a/tools/testing/selftests/vm/gup_benchmark.c
> > +++ b/tools/testing/selftests/vm/gup_benchmark.c
> > @@ -15,8 +15,9 @@
> > #define PAGE_SIZE sysconf(_SC_PAGESIZE)
> >
> > #define GUP_FAST_BENCHMARK _IOWR('g', 1, struct gup_benchmark)
> > -#define GUP_LONGTERM_BENCHMARK _IOWR('g', 2, struct gup_benchmark)
> > -#define GUP_BENCHMARK _IOWR('g', 3, struct gup_benchmark)
> > +#define GUP_FAST_LONGTERM_BENCHMARK _IOWR('g', 2, struct gup_benchmark)
> > +#define GUP_LONGTERM_BENCHMARK _IOWR('g', 3, struct gup_benchmark)
> > +#define GUP_BENCHMARK _IOWR('g', 4, struct gup_benchmark)
> >
> > struct gup_benchmark {
> > __u64 get_delta_usec;
> > @@ -37,7 +38,7 @@ int main(int argc, char **argv)
> > char *file = "/dev/zero";
> > char *p;
> >
> > - while ((opt = getopt(argc, argv, "m:r:n:f:tTLUSH")) != -1) {
> > + while ((opt = getopt(argc, argv, "m:r:n:f:tTlLUSH")) != -1) {
> > switch (opt) {
> > case 'm':
> > size = atoi(optarg) * MB;
> > @@ -54,6 +55,9 @@ int main(int argc, char **argv)
> > case 'T':
> > thp = 0;
> > break;
> > + case 'l':
> > + cmd = GUP_FAST_LONGTERM_BENCHMARK;
> > + break;
> > case 'L':
> > cmd = GUP_LONGTERM_BENCHMARK;
> > break;
> > --
> > 2.7.5
> >
>
