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 1/3] tools bitmap: implement bitmap_equal() operation at bitmap API
Date: Tue, 3 Dec 2019 14:43:33 +0300 [thread overview]
Message-ID: <43757993-0b28-d8af-a6c7-ede12e3a6877@linux.intel.com> (raw)
In-Reply-To: <d1aead99-474a-46d3-36be-36dbb8e5581b@linux.intel.com>
Extend tools bitmap API with bitmap_equal() implementation.
The implementation has been derived from the kernel.
Extend tools bitmap API with bitmap_free() implementation for
symmetry with bitmap_alloc() function.
Signed-off-by: Alexey Budankov <alexey.budankov@linux.intel.com>
---
tools/include/linux/bitmap.h | 30 ++++++++++++++++++++++++++++++
tools/lib/bitmap.c | 15 +++++++++++++++
2 files changed, 45 insertions(+)
diff --git a/tools/include/linux/bitmap.h b/tools/include/linux/bitmap.h
index 05dca5c203f3..477a1cae513f 100644
--- a/tools/include/linux/bitmap.h
+++ b/tools/include/linux/bitmap.h
@@ -15,6 +15,8 @@ void __bitmap_or(unsigned long *dst, const unsigned long *bitmap1,
const unsigned long *bitmap2, int bits);
int __bitmap_and(unsigned long *dst, const unsigned long *bitmap1,
const unsigned long *bitmap2, unsigned int bits);
+int __bitmap_equal(const unsigned long *bitmap1,
+ const unsigned long *bitmap2, unsigned int bits);
void bitmap_clear(unsigned long *map, unsigned int start, int len);
#define BITMAP_FIRST_WORD_MASK(start) (~0UL << ((start) & (BITS_PER_LONG - 1)))
@@ -123,6 +125,15 @@ static inline unsigned long *bitmap_alloc(int nbits)
return calloc(1, BITS_TO_LONGS(nbits) * sizeof(unsigned long));
}
+/*
+ * bitmap_free - Free bitmap
+ * @bitmap: pointer to bitmap
+ */
+static inline void bitmap_free(unsigned long *bitmap)
+{
+ free(bitmap);
+}
+
/*
* bitmap_scnprintf - print bitmap list into buffer
* @bitmap: bitmap
@@ -148,4 +159,23 @@ static inline int bitmap_and(unsigned long *dst, const unsigned long *src1,
return __bitmap_and(dst, src1, src2, nbits);
}
+#ifdef __LITTLE_ENDIAN
+#define BITMAP_MEM_ALIGNMENT 8
+#else
+#define BITMAP_MEM_ALIGNMENT (8 * sizeof(unsigned long))
+#endif
+#define BITMAP_MEM_MASK (BITMAP_MEM_ALIGNMENT - 1)
+#define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == 0)
+
+static inline int bitmap_equal(const unsigned long *src1,
+ const unsigned long *src2, unsigned int nbits)
+{
+ if (small_const_nbits(nbits))
+ return !((*src1 ^ *src2) & BITMAP_LAST_WORD_MASK(nbits));
+ if (__builtin_constant_p(nbits & BITMAP_MEM_MASK) &&
+ IS_ALIGNED(nbits, BITMAP_MEM_ALIGNMENT))
+ return !memcmp(src1, src2, nbits / 8);
+ return __bitmap_equal(src1, src2, nbits);
+}
+
#endif /* _PERF_BITOPS_H */
diff --git a/tools/lib/bitmap.c b/tools/lib/bitmap.c
index 38494782be06..5043747ef6c5 100644
--- a/tools/lib/bitmap.c
+++ b/tools/lib/bitmap.c
@@ -71,3 +71,18 @@ int __bitmap_and(unsigned long *dst, const unsigned long *bitmap1,
BITMAP_LAST_WORD_MASK(bits));
return result != 0;
}
+
+int __bitmap_equal(const unsigned long *bitmap1,
+ const unsigned long *bitmap2, unsigned int bits)
+{
+ unsigned int k, lim = bits/BITS_PER_LONG;
+ for (k = 0; k < lim; ++k)
+ if (bitmap1[k] != bitmap2[k])
+ return 0;
+
+ if (bits % BITS_PER_LONG)
+ if ((bitmap1[k] ^ bitmap2[k]) & BITMAP_LAST_WORD_MASK(bits))
+ return 0;
+
+ return 1;
+}
--
2.20.1
next prev parent reply other threads:[~2019-12-03 11:43 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 ` Alexey Budankov [this message]
2020-01-10 17:53 ` [tip: perf/core] tools bitmap: Implement bitmap_equal() operation at bitmap API tip-bot2 for Alexey Budankov
2019-12-03 11:44 ` [PATCH v5 2/3] perf mmap: declare type for cpu mask of arbitrary length Alexey Budankov
2019-12-04 13:49 ` 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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