From: Alexey Budankov <alexey.budankov@linux.intel.com>
To: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>, Namhyung Kim <namhyung@kernel.org>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>, Andi Kleen <ak@linux.intel.com>,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: [PATCH v5 2/3] perf mmap: declare type for cpu mask of arbitrary length
Date: Tue, 3 Dec 2019 14:44:18 +0300 [thread overview]
Message-ID: <0fd2454f-477f-d15a-f4ee-79bcbd2585ff@linux.intel.com> (raw)
In-Reply-To: <d1aead99-474a-46d3-36be-36dbb8e5581b@linux.intel.com>
Declare a dedicated struct map_cpu_mask type for cpu masks of
arbitrary length. Mask is available thru bits pointer and the
mask length is kept in nbits field. MMAP_CPU_MASK_BYTES() macro
returns mask storage size in bytes. mmap_cpu_mask__scnprintf()
function can be used to log text representation of the mask.
Signed-off-by: Alexey Budankov <alexey.budankov@linux.intel.com>
---
tools/perf/util/mmap.c | 12 ++++++++++++
tools/perf/util/mmap.h | 11 +++++++++++
2 files changed, 23 insertions(+)
diff --git a/tools/perf/util/mmap.c b/tools/perf/util/mmap.c
index 063d1b93c53d..43c12b4a3e17 100644
--- a/tools/perf/util/mmap.c
+++ b/tools/perf/util/mmap.c
@@ -23,6 +23,18 @@
#include "mmap.h"
#include "../perf.h"
#include <internal/lib.h> /* page_size */
+#include <linux/bitmap.h>
+
+#define MASK_SIZE 1023
+void mmap_cpu_mask__scnprintf(struct mmap_cpu_mask *mask, const char *tag)
+{
+ char buf[MASK_SIZE + 1];
+ size_t len;
+
+ len = bitmap_scnprintf(mask->bits, mask->nbits, buf, MASK_SIZE);
+ buf[len] = '\0';
+ pr_debug("%p: %s mask[%ld]: %s\n", mask, tag, mask->nbits, buf);
+}
size_t mmap__mmap_len(struct mmap *map)
{
diff --git a/tools/perf/util/mmap.h b/tools/perf/util/mmap.h
index bee4e83f7109..ef51667fabcb 100644
--- a/tools/perf/util/mmap.h
+++ b/tools/perf/util/mmap.h
@@ -15,6 +15,15 @@
#include "event.h"
struct aiocb;
+
+struct mmap_cpu_mask {
+ unsigned long *bits;
+ size_t nbits;
+};
+
+#define MMAP_CPU_MASK_BYTES(m) \
+ (BITS_TO_LONGS(((struct mmap_cpu_mask *)m)->nbits) * sizeof(unsigned long))
+
/**
* struct mmap - perf's ring buffer mmap details
*
@@ -52,4 +61,6 @@ int perf_mmap__push(struct mmap *md, void *to,
size_t mmap__mmap_len(struct mmap *map);
+void mmap_cpu_mask__scnprintf(struct mmap_cpu_mask *mask, const char *tag);
+
#endif /*__PERF_MMAP_H */
--
2.20.1
next prev parent reply other threads:[~2019-12-03 11:44 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-03 11:41 [PATCH v5 0/3] perf record: adapt NUMA awareness to machines with #CPUs > 1K Alexey Budankov
2019-12-03 11:43 ` [PATCH v5 1/3] tools bitmap: implement bitmap_equal() operation at bitmap API Alexey Budankov
2020-01-10 17:53 ` [tip: perf/core] tools bitmap: Implement " tip-bot2 for Alexey Budankov
2019-12-03 11:44 ` Alexey Budankov [this message]
2019-12-04 13:49 ` [PATCH v5 2/3] perf mmap: declare type for cpu mask of arbitrary length Arnaldo Carvalho de Melo
2019-12-05 7:31 ` Alexey Budankov
2020-01-10 17:53 ` [tip: perf/core] perf mmap: Declare " tip-bot2 for Alexey Budankov
2019-12-03 11:45 ` [PATCH v5 3/3] perf record: adapt affinity to machines with #CPUs > 1K Alexey Budankov
2019-12-04 13:48 ` Arnaldo Carvalho de Melo
2019-12-05 7:30 ` Alexey Budankov
2020-01-10 17:53 ` [tip: perf/core] perf record: Adapt " tip-bot2 for Alexey Budankov
2019-12-03 12:17 ` [PATCH v5 0/3] perf record: adapt NUMA awareness " Jiri Olsa
2019-12-03 18:36 ` Arnaldo Carvalho de Melo
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