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| author | Keith Busch <keith.busch@intel.com> | 2018-10-26 15:09:52 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-10-26 16:38:15 -0700 |
| commit | 26db3d09d9e1963c9db77cb275bd2d36e56ef57a (patch) | |
| tree | 64343b6d275974aca5c2f8487ebf7d216edf45b4 /mm | |
| parent | 7a1adfddaf0d11a39fdcaf6e82a88e9c0586e08b (diff) | |
| download | lwn-26db3d09d9e1963c9db77cb275bd2d36e56ef57a.tar.gz lwn-26db3d09d9e1963c9db77cb275bd2d36e56ef57a.zip | |
mm/gup_benchmark.c: time put_page()
We'd like to measure time to unpin user pages, so this adds a second
benchmark timer on put_page, separate from get_page.
Adding the field breaks this ioctl ABI, but should be okay since this an
in-tree kernel selftest.
[akpm@linux-foundation.org: add expansion to struct gup_benchmark for future use]
Link: http://lkml.kernel.org/r/20181010195605.10689-1-keith.busch@intel.com
Signed-off-by: Keith Busch <keith.busch@intel.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/gup_benchmark.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/mm/gup_benchmark.c b/mm/gup_benchmark.c index 7405c9d89d65..e6aff102373b 100644 --- a/mm/gup_benchmark.c +++ b/mm/gup_benchmark.c @@ -8,11 +8,13 @@ #define GUP_FAST_BENCHMARK _IOWR('g', 1, struct gup_benchmark) struct gup_benchmark { - __u64 delta_usec; + __u64 get_delta_usec; + __u64 put_delta_usec; __u64 addr; __u64 size; __u32 nr_pages_per_call; __u32 flags; + __u64 expansion[10]; /* For future use */ }; static int __gup_benchmark_ioctl(unsigned int cmd, @@ -48,14 +50,17 @@ static int __gup_benchmark_ioctl(unsigned int cmd, } end_time = ktime_get(); - gup->delta_usec = ktime_us_delta(end_time, start_time); + gup->get_delta_usec = ktime_us_delta(end_time, start_time); gup->size = addr - gup->addr; + start_time = ktime_get(); for (i = 0; i < nr_pages; i++) { if (!pages[i]) break; put_page(pages[i]); } + end_time = ktime_get(); + gup->put_delta_usec = ktime_us_delta(end_time, start_time); kvfree(pages); return 0; |