perf evlist: Pass mmap parameters in a struct

In preparation for adding more mmap parameters, pass existing parameters
in a struct.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1405332185-4050-29-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index c51223a..814e954 100644 (file)
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -606,12 +606,17 @@ static int perf_evlist__alloc_mmap(struct perf_evlist *evlist)
        return evlist->mmap != NULL ? 0 : -ENOMEM;
 }
 
-static int __perf_evlist__mmap(struct perf_evlist *evlist,
-                              int idx, int prot, int mask, int fd)
+struct mmap_params {
+       int prot;
+       int mask;
+};
+
+static int __perf_evlist__mmap(struct perf_evlist *evlist, int idx,
+                              struct mmap_params *mp, int fd)
 {
        evlist->mmap[idx].prev = 0;
-       evlist->mmap[idx].mask = mask;
-       evlist->mmap[idx].base = mmap(NULL, evlist->mmap_len, prot,
+       evlist->mmap[idx].mask = mp->mask;
+       evlist->mmap[idx].base = mmap(NULL, evlist->mmap_len, mp->prot,
                                      MAP_SHARED, fd, 0);
        if (evlist->mmap[idx].base == MAP_FAILED) {
                pr_debug2("failed to mmap perf event ring buffer, error %d\n",
@@ -625,8 +630,8 @@ static int __perf_evlist__mmap(struct perf_evlist *evlist,
 }
 
 static int perf_evlist__mmap_per_evsel(struct perf_evlist *evlist, int idx,
-                                      int prot, int mask, int cpu, int thread,
-                                      int *output)
+                                      struct mmap_params *mp, int cpu,
+                                      int thread, int *output)
 {
        struct perf_evsel *evsel;
 
@@ -635,8 +640,7 @@ static int perf_evlist__mmap_per_evsel(struct perf_evlist *evlist, int idx,
 
                if (*output == -1) {
                        *output = fd;
-                       if (__perf_evlist__mmap(evlist, idx, prot, mask,
-                                               *output) < 0)
+                       if (__perf_evlist__mmap(evlist, idx, mp, *output) < 0)
                                return -1;
                } else {
                        if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, *output) != 0)
@@ -651,8 +655,8 @@ static int perf_evlist__mmap_per_evsel(struct perf_evlist *evlist, int idx,
        return 0;
 }
 
-static int perf_evlist__mmap_per_cpu(struct perf_evlist *evlist, int prot,
-                                    int mask)
+static int perf_evlist__mmap_per_cpu(struct perf_evlist *evlist,
+                                    struct mmap_params *mp)
 {
        int cpu, thread;
        int nr_cpus = cpu_map__nr(evlist->cpus);
@@ -663,8 +667,8 @@ static int perf_evlist__mmap_per_cpu(struct perf_evlist *evlist, int prot,
                int output = -1;
 
                for (thread = 0; thread < nr_threads; thread++) {
-                       if (perf_evlist__mmap_per_evsel(evlist, cpu, prot, mask,
-                                                       cpu, thread, &output))
+                       if (perf_evlist__mmap_per_evsel(evlist, cpu, mp, cpu,
+                                                       thread, &output))
                                goto out_unmap;
                }
        }
@@ -677,8 +681,8 @@ out_unmap:
        return -1;
 }
 
-static int perf_evlist__mmap_per_thread(struct perf_evlist *evlist, int prot,
-                                       int mask)
+static int perf_evlist__mmap_per_thread(struct perf_evlist *evlist,
+                                       struct mmap_params *mp)
 {
        int thread;
        int nr_threads = thread_map__nr(evlist->threads);
@@ -687,8 +691,8 @@ static int perf_evlist__mmap_per_thread(struct perf_evlist *evlist, int prot,
        for (thread = 0; thread < nr_threads; thread++) {
                int output = -1;
 
-               if (perf_evlist__mmap_per_evsel(evlist, thread, prot, mask, 0,
-                                               thread, &output))
+               if (perf_evlist__mmap_per_evsel(evlist, thread, mp, 0, thread,
+                                               &output))
                        goto out_unmap;
        }
 
@@ -793,7 +797,9 @@ int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages,
        struct perf_evsel *evsel;
        const struct cpu_map *cpus = evlist->cpus;
        const struct thread_map *threads = evlist->threads;
-       int prot = PROT_READ | (overwrite ? 0 : PROT_WRITE), mask;
+       struct mmap_params mp = {
+               .prot = PROT_READ | (overwrite ? 0 : PROT_WRITE),
+       };
 
        if (evlist->mmap == NULL && perf_evlist__alloc_mmap(evlist) < 0)
                return -ENOMEM;
@@ -804,7 +810,7 @@ int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages,
        evlist->overwrite = overwrite;
        evlist->mmap_len = perf_evlist__mmap_size(pages);
        pr_debug("mmap size %zuB\n", evlist->mmap_len);
-       mask = evlist->mmap_len - page_size - 1;
+       mp.mask = evlist->mmap_len - page_size - 1;
 
        evlist__for_each(evlist, evsel) {
                if ((evsel->attr.read_format & PERF_FORMAT_ID) &&
@@ -814,9 +820,9 @@ int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages,
        }
 
        if (cpu_map__empty(cpus))
-               return perf_evlist__mmap_per_thread(evlist, prot, mask);
+               return perf_evlist__mmap_per_thread(evlist, &mp);
 
-       return perf_evlist__mmap_per_cpu(evlist, prot, mask);
+       return perf_evlist__mmap_per_cpu(evlist, &mp);
 }
 
 int perf_evlist__create_maps(struct perf_evlist *evlist, struct target *target)