| Message ID | 20191113042710.3997854-21-jhubbard@nvidia.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | mm/gup: track dma-pinned pages: FOLL_PIN, FOLL_LONGTERM | expand |
On Tue, Nov 12, 2019 at 08:27:07PM -0800, John Hubbard wrote: > Fix the gup benchmark flags to use the symbolic FOLL_WRITE, > instead of a hard-coded "1" value. > > Also, clean up the filtering of gup flags a little, by just doing > it once before issuing any of the get_user_pages*() calls. This > makes it harder to overlook, instead of having little "gup_flags & 1" > phrases in the function calls. > > Signed-off-by: John Hubbard <jhubbard@nvidia.com> Reviewed-by: Ira Weiny <ira.weiny@intel.com> > --- > mm/gup_benchmark.c | 9 ++++++--- > tools/testing/selftests/vm/gup_benchmark.c | 6 +++++- > 2 files changed, 11 insertions(+), 4 deletions(-) > > diff --git a/mm/gup_benchmark.c b/mm/gup_benchmark.c > index 7dd602d7f8db..7fc44d25eca7 100644 > --- a/mm/gup_benchmark.c > +++ b/mm/gup_benchmark.c > @@ -48,18 +48,21 @@ static int __gup_benchmark_ioctl(unsigned int cmd, > nr = (next - addr) / PAGE_SIZE; > } > > + /* Filter out most gup flags: only allow a tiny subset here: */ > + gup->flags &= FOLL_WRITE; > + > switch (cmd) { > case GUP_FAST_BENCHMARK: > - nr = get_user_pages_fast(addr, nr, gup->flags & 1, > + nr = get_user_pages_fast(addr, nr, gup->flags, > pages + i); > break; > case GUP_LONGTERM_BENCHMARK: > nr = get_user_pages(addr, nr, > - (gup->flags & 1) | FOLL_LONGTERM, > + gup->flags | FOLL_LONGTERM, > pages + i, NULL); > break; > case GUP_BENCHMARK: > - nr = get_user_pages(addr, nr, gup->flags & 1, pages + i, > + nr = get_user_pages(addr, nr, gup->flags, pages + i, > NULL); > break; > default: > diff --git a/tools/testing/selftests/vm/gup_benchmark.c b/tools/testing/selftests/vm/gup_benchmark.c > index 485cf06ef013..389327e9b30a 100644 > --- a/tools/testing/selftests/vm/gup_benchmark.c > +++ b/tools/testing/selftests/vm/gup_benchmark.c > @@ -18,6 +18,9 @@ > #define GUP_LONGTERM_BENCHMARK _IOWR('g', 2, struct gup_benchmark) > #define GUP_BENCHMARK _IOWR('g', 3, struct gup_benchmark) > > +/* Just the flags we need, copied from mm.h: */ > +#define FOLL_WRITE 0x01 /* check pte is writable */ > + > struct gup_benchmark { > __u64 get_delta_usec; > __u64 put_delta_usec; > @@ -85,7 +88,8 @@ int main(int argc, char **argv) > } > > gup.nr_pages_per_call = nr_pages; > - gup.flags = write; > + if (write) > + gup.flags |= FOLL_WRITE; > > fd = open("/sys/kernel/debug/gup_benchmark", O_RDWR); > if (fd == -1) > -- > 2.24.0 >
diff --git a/mm/gup_benchmark.c b/mm/gup_benchmark.c index 7dd602d7f8db..7fc44d25eca7 100644 --- a/mm/gup_benchmark.c +++ b/mm/gup_benchmark.c @@ -48,18 +48,21 @@ static int __gup_benchmark_ioctl(unsigned int cmd, nr = (next - addr) / PAGE_SIZE; } + /* Filter out most gup flags: only allow a tiny subset here: */ + gup->flags &= FOLL_WRITE; + switch (cmd) { case GUP_FAST_BENCHMARK: - nr = get_user_pages_fast(addr, nr, gup->flags & 1, + nr = get_user_pages_fast(addr, nr, gup->flags, pages + i); break; case GUP_LONGTERM_BENCHMARK: nr = get_user_pages(addr, nr, - (gup->flags & 1) | FOLL_LONGTERM, + gup->flags | FOLL_LONGTERM, pages + i, NULL); break; case GUP_BENCHMARK: - nr = get_user_pages(addr, nr, gup->flags & 1, pages + i, + nr = get_user_pages(addr, nr, gup->flags, pages + i, NULL); break; default: diff --git a/tools/testing/selftests/vm/gup_benchmark.c b/tools/testing/selftests/vm/gup_benchmark.c index 485cf06ef013..389327e9b30a 100644 --- a/tools/testing/selftests/vm/gup_benchmark.c +++ b/tools/testing/selftests/vm/gup_benchmark.c @@ -18,6 +18,9 @@ #define GUP_LONGTERM_BENCHMARK _IOWR('g', 2, struct gup_benchmark) #define GUP_BENCHMARK _IOWR('g', 3, struct gup_benchmark) +/* Just the flags we need, copied from mm.h: */ +#define FOLL_WRITE 0x01 /* check pte is writable */ + struct gup_benchmark { __u64 get_delta_usec; __u64 put_delta_usec; @@ -85,7 +88,8 @@ int main(int argc, char **argv) } gup.nr_pages_per_call = nr_pages; - gup.flags = write; + if (write) + gup.flags |= FOLL_WRITE; fd = open("/sys/kernel/debug/gup_benchmark", O_RDWR); if (fd == -1)
Fix the gup benchmark flags to use the symbolic FOLL_WRITE, instead of a hard-coded "1" value. Also, clean up the filtering of gup flags a little, by just doing it once before issuing any of the get_user_pages*() calls. This makes it harder to overlook, instead of having little "gup_flags & 1" phrases in the function calls. Signed-off-by: John Hubbard <jhubbard@nvidia.com> --- mm/gup_benchmark.c | 9 ++++++--- tools/testing/selftests/vm/gup_benchmark.c | 6 +++++- 2 files changed, 11 insertions(+), 4 deletions(-)