perf bench mem: Move boilerplate memory allocation to the infrastructure

Instead of having all tests perform alloc/free, do it in the code that
calls the do_cycles() and do_gettimeofday() functions.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-lywj4mbdb1m9x1z9asivwuuy@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/bench/mem-functions.c b/tools/perf/bench/mem-functions.c
index c684910..52504a8 100644 (file)
--- a/tools/perf/bench/mem-functions.c
+++ b/tools/perf/bench/mem-functions.c
@@ -106,9 +106,10 @@ static double timeval2double(struct timeval *ts)
 
 struct bench_mem_info {
        const struct function *functions;
-       u64 (*do_cycles)(const struct function *r, size_t size);
-       double (*do_gettimeofday)(const struct function *r, size_t size);
+       u64 (*do_cycles)(const struct function *r, size_t size, void *src, void *dst);
+       double (*do_gettimeofday)(const struct function *r, size_t size, void *src, void *dst);
        const char *const *usage;
+       bool alloc_src;
 };
 
 static void __bench_mem_function(struct bench_mem_info *info, int r_idx, size_t size, double size_total)
@@ -116,16 +117,26 @@ static void __bench_mem_function(struct bench_mem_info *info, int r_idx, size_t
        const struct function *r = &info->functions[r_idx];
        double result_bps = 0.0;
        u64 result_cycles = 0;
+       void *src = NULL, *dst = zalloc(size);
 
        printf("# function '%s' (%s)\n", r->name, r->desc);
 
+       if (dst == NULL)
+               goto out_alloc_failed;
+
+       if (info->alloc_src) {
+               src = zalloc(size);
+               if (src == NULL)
+                       goto out_alloc_failed;
+       }
+
        if (bench_format == BENCH_FORMAT_DEFAULT)
                printf("# Copying %s bytes ...\n\n", size_str);
 
        if (use_cycles) {
-               result_cycles = info->do_cycles(r, size);
+               result_cycles = info->do_cycles(r, size, src, dst);
        } else {
-               result_bps = info->do_gettimeofday(r, size);
+               result_bps = info->do_gettimeofday(r, size, src, dst);
        }
 
        switch (bench_format) {
@@ -149,6 +160,14 @@ static void __bench_mem_function(struct bench_mem_info *info, int r_idx, size_t
                BUG_ON(1);
                break;
        }
+
+out_free:
+       free(src);
+       free(dst);
+       return;
+out_alloc_failed:
+       printf("# Memory allocation failed - maybe size (%s) is too large?\n", size_str);
+       goto out_free;
 }
 
 static int bench_mem_common(int argc, const char **argv, struct bench_mem_info *info)
@@ -201,28 +220,14 @@ static int bench_mem_common(int argc, const char **argv, struct bench_mem_info *
        return 0;
 }
 
-static void memcpy_alloc_mem(void **dst, void **src, size_t size)
-{
-       *dst = zalloc(size);
-       if (!*dst)
-               die("memory allocation failed - maybe size is too large?\n");
-
-       *src = zalloc(size);
-       if (!*src)
-               die("memory allocation failed - maybe size is too large?\n");
-
-       /* Make sure to always prefault zero pages even if MMAP_THRESH is crossed: */
-       memset(*src, 0, size);
-}
-
-static u64 do_memcpy_cycles(const struct function *r, size_t size)
+static u64 do_memcpy_cycles(const struct function *r, size_t size, void *src, void *dst)
 {
        u64 cycle_start = 0ULL, cycle_end = 0ULL;
-       void *src = NULL, *dst = NULL;
        memcpy_t fn = r->fn.memcpy;
        int i;
 
-       memcpy_alloc_mem(&dst, &src, size);
+       /* Make sure to always prefault zero pages even if MMAP_THRESH is crossed: */
+       memset(src, 0, size);
 
        /*
         * We prefault the freshly allocated memory range here,
@@ -235,20 +240,15 @@ static u64 do_memcpy_cycles(const struct function *r, size_t size)
                fn(dst, src, size);
        cycle_end = get_cycles();
 
-       free(src);
-       free(dst);
        return cycle_end - cycle_start;
 }
 
-static double do_memcpy_gettimeofday(const struct function *r, size_t size)
+static double do_memcpy_gettimeofday(const struct function *r, size_t size, void *src, void *dst)
 {
        struct timeval tv_start, tv_end, tv_diff;
        memcpy_t fn = r->fn.memcpy;
-       void *src = NULL, *dst = NULL;
        int i;
 
-       memcpy_alloc_mem(&dst, &src, size);
-
        /*
         * We prefault the freshly allocated memory range here,
         * to not measure page fault overhead:
@@ -262,9 +262,6 @@ static double do_memcpy_gettimeofday(const struct function *r, size_t size)
 
        timersub(&tv_end, &tv_start, &tv_diff);
 
-       free(src);
-       free(dst);
-
        return (double)(((double)size * nr_loops) / timeval2double(&tv_diff));
 }
 
@@ -294,27 +291,18 @@ int bench_mem_memcpy(int argc, const char **argv, const char *prefix __maybe_unu
                .do_cycles              = do_memcpy_cycles,
                .do_gettimeofday        = do_memcpy_gettimeofday,
                .usage                  = bench_mem_memcpy_usage,
+               .alloc_src              = true,
        };
 
        return bench_mem_common(argc, argv, &info);
 }
 
-static void memset_alloc_mem(void **dst, size_t size)
-{
-       *dst = zalloc(size);
-       if (!*dst)
-               die("memory allocation failed - maybe size is too large?\n");
-}
-
-static u64 do_memset_cycles(const struct function *r, size_t size)
+static u64 do_memset_cycles(const struct function *r, size_t size, void *src __maybe_unused, void *dst)
 {
        u64 cycle_start = 0ULL, cycle_end = 0ULL;
        memset_t fn = r->fn.memset;
-       void *dst = NULL;
        int i;
 
-       memset_alloc_mem(&dst, size);
-
        /*
         * We prefault the freshly allocated memory range here,
         * to not measure page fault overhead:
@@ -326,19 +314,15 @@ static u64 do_memset_cycles(const struct function *r, size_t size)
                fn(dst, i, size);
        cycle_end = get_cycles();
 
-       free(dst);
        return cycle_end - cycle_start;
 }
 
-static double do_memset_gettimeofday(const struct function *r, size_t size)
+static double do_memset_gettimeofday(const struct function *r, size_t size, void *src __maybe_unused, void *dst)
 {
        struct timeval tv_start, tv_end, tv_diff;
        memset_t fn = r->fn.memset;
-       void *dst = NULL;
        int i;
 
-       memset_alloc_mem(&dst, size);
-
        /*
         * We prefault the freshly allocated memory range here,
         * to not measure page fault overhead:
@@ -352,7 +336,6 @@ static double do_memset_gettimeofday(const struct function *r, size_t size)
 
        timersub(&tv_end, &tv_start, &tv_diff);
 
-       free(dst);
        return (double)(((double)size * nr_loops) / timeval2double(&tv_diff));
 }