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perf tools: Use for_each_set_bit() to iterate over feature flags

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This patch introduces the for_each_set_bit() macro and modifies feature
implementation to use it.

Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1323248577-11268-8-git-send-email-robert.richter@amd.com
Signed-off-by: Robert Richter <robert.richter@amd.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Robert Richter 2011-12-07 10:02:57 +01:00 committed by Arnaldo Carvalho de Melo
parent e20960c027
commit b1e5a9bee3
3 changed files with 149 additions and 93 deletions
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118
tools/perf/util/header.c
View File

@ -8,6 +8,7 @@
#include <stdlib.h>
#include <linux/list.h>
#include <linux/kernel.h>
#include <linux/bitops.h>
#include <sys/utsname.h>
#include "evlist.h"
@ -1353,7 +1354,7 @@ static int perf_file_section__fprintf_info(struct perf_file_section *section,
"%d, continuing...\n", section->offset, feat);
return 0;
}
if (feat < HEADER_TRACE_INFO || feat >= HEADER_LAST_FEATURE) {
if (feat >= HEADER_LAST_FEATURE) {
pr_warning("unknown feature %d\n", feat);
return 0;
}
@ -1390,6 +1391,8 @@ static int do_write_feat(int fd, struct perf_header *h, int type,
int ret = 0;
if (perf_header__has_feat(h, type)) {
if (!feat_ops[type].write)
return -1;
(*p)->offset = lseek(fd, 0, SEEK_CUR);
@ -1416,6 +1419,7 @@ static int perf_header__adds_write(struct perf_header *header,
struct perf_file_section *feat_sec, *p;
int sec_size;
u64 sec_start;
int feat;
int err;
session = container_of(header, struct perf_session, header);
@ -1433,61 +1437,10 @@ static int perf_header__adds_write(struct perf_header *header,
sec_start = header->data_offset + header->data_size;
lseek(fd, sec_start + sec_size, SEEK_SET);
err = do_write_feat(fd, header, HEADER_TRACE_INFO, &p, evlist);
if (err)
perf_header__clear_feat(header, HEADER_TRACE_INFO);
err = do_write_feat(fd, header, HEADER_BUILD_ID, &p, evlist);
if (err)
perf_header__clear_feat(header, HEADER_BUILD_ID);
err = do_write_feat(fd, header, HEADER_HOSTNAME, &p, evlist);
if (err)
perf_header__clear_feat(header, HEADER_HOSTNAME);
err = do_write_feat(fd, header, HEADER_OSRELEASE, &p, evlist);
if (err)
perf_header__clear_feat(header, HEADER_OSRELEASE);
err = do_write_feat(fd, header, HEADER_VERSION, &p, evlist);
if (err)
perf_header__clear_feat(header, HEADER_VERSION);
err = do_write_feat(fd, header, HEADER_ARCH, &p, evlist);
if (err)
perf_header__clear_feat(header, HEADER_ARCH);
err = do_write_feat(fd, header, HEADER_NRCPUS, &p, evlist);
if (err)
perf_header__clear_feat(header, HEADER_NRCPUS);
err = do_write_feat(fd, header, HEADER_CPUDESC, &p, evlist);
if (err)
perf_header__clear_feat(header, HEADER_CPUDESC);
err = do_write_feat(fd, header, HEADER_CPUID, &p, evlist);
if (err)
perf_header__clear_feat(header, HEADER_CPUID);
err = do_write_feat(fd, header, HEADER_TOTAL_MEM, &p, evlist);
if (err)
perf_header__clear_feat(header, HEADER_TOTAL_MEM);
err = do_write_feat(fd, header, HEADER_CMDLINE, &p, evlist);
if (err)
perf_header__clear_feat(header, HEADER_CMDLINE);
err = do_write_feat(fd, header, HEADER_EVENT_DESC, &p, evlist);
if (err)
perf_header__clear_feat(header, HEADER_EVENT_DESC);
err = do_write_feat(fd, header, HEADER_CPU_TOPOLOGY, &p, evlist);
if (err)
perf_header__clear_feat(header, HEADER_CPU_TOPOLOGY);
err = do_write_feat(fd, header, HEADER_NUMA_TOPOLOGY, &p, evlist);
if (err)
perf_header__clear_feat(header, HEADER_NUMA_TOPOLOGY);
for_each_set_bit(feat, header->adds_features, HEADER_FEAT_BITS) {
if (do_write_feat(fd, header, feat, &p, evlist))
perf_header__clear_feat(header, feat);
}
lseek(fd, sec_start, SEEK_SET);
/*
@ -1634,20 +1587,20 @@ static int perf_header__getbuffer64(struct perf_header *header,
int perf_header__process_sections(struct perf_header *header, int fd,
void *data,
int (*process)(struct perf_file_section *section,
struct perf_header *ph,
int feat, int fd, void *data))
struct perf_header *ph,
int feat, int fd, void *data))
{
struct perf_file_section *feat_sec;
struct perf_file_section *feat_sec, *sec;
int nr_sections;
int sec_size;
int idx = 0;
int err = -1, feat = 1;
int feat;
int err;
nr_sections = bitmap_weight(header->adds_features, HEADER_FEAT_BITS);
if (!nr_sections)
return 0;
feat_sec = calloc(sizeof(*feat_sec), nr_sections);
feat_sec = sec = calloc(sizeof(*feat_sec), nr_sections);
if (!feat_sec)
return -1;
@ -1655,20 +1608,16 @@ int perf_header__process_sections(struct perf_header *header, int fd,
lseek(fd, header->data_offset + header->data_size, SEEK_SET);
if (perf_header__getbuffer64(header, fd, feat_sec, sec_size))
err = perf_header__getbuffer64(header, fd, feat_sec, sec_size);
if (err < 0)
goto out_free;
err = 0;
while (idx < nr_sections && feat < HEADER_LAST_FEATURE) {
if (perf_header__has_feat(header, feat)) {
struct perf_file_section *sec = &feat_sec[idx++];
err = process(sec, header, feat, fd, data);
if (err < 0)
break;
}
++feat;
for_each_set_bit(feat, header->adds_features, HEADER_LAST_FEATURE) {
err = process(sec++, header, feat, fd, data);
if (err < 0)
goto out_free;
}
err = 0;
out_free:
free(feat_sec);
return err;
@ -1903,32 +1852,21 @@ static int perf_file_section__process(struct perf_file_section *section,
return 0;
}
if (feat >= HEADER_LAST_FEATURE) {
pr_debug("unknown feature %d, continuing...\n", feat);
return 0;
}
switch (feat) {
case HEADER_TRACE_INFO:
trace_report(fd, false);
break;
case HEADER_BUILD_ID:
if (perf_header__read_build_ids(ph, fd, section->offset, section->size))
pr_debug("Failed to read buildids, continuing...\n");
break;
case HEADER_HOSTNAME:
case HEADER_OSRELEASE:
case HEADER_VERSION:
case HEADER_ARCH:
case HEADER_NRCPUS:
case HEADER_CPUDESC:
case HEADER_CPUID:
case HEADER_TOTAL_MEM:
case HEADER_CMDLINE:
case HEADER_EVENT_DESC:
case HEADER_CPU_TOPOLOGY:
case HEADER_NUMA_TOPOLOGY:
break;
default:
pr_debug("unknown feature %d, continuing...\n", feat);
break;
}
return 0;

6
tools/perf/util/header.h
View File

@ -10,7 +10,8 @@
#include <linux/bitmap.h>
enum {
HEADER_TRACE_INFO = 1,
HEADER_RESERVED = 0, /* always cleared */
HEADER_TRACE_INFO = 1,
HEADER_BUILD_ID,
HEADER_HOSTNAME,
@ -27,10 +28,9 @@ enum {
HEADER_NUMA_TOPOLOGY,
HEADER_LAST_FEATURE,
HEADER_FEAT_BITS = 256,
};
#define HEADER_FEAT_BITS 256
struct perf_file_section {
u64 offset;
u64 size;

118
tools/perf/util/include/linux/bitops.h
View File

@ -9,6 +9,17 @@
#define BITS_PER_BYTE 8
#define BITS_TO_LONGS(nr) DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long))
#define for_each_set_bit(bit, addr, size) \
for ((bit) = find_first_bit((addr), (size)); \
(bit) < (size); \
(bit) = find_next_bit((addr), (size), (bit) + 1))
/* same as for_each_set_bit() but use bit as value to start with */
#define for_each_set_bit_cont(bit, addr, size) \
for ((bit) = find_next_bit((addr), (size), (bit)); \
(bit) < (size); \
(bit) = find_next_bit((addr), (size), (bit) + 1))
static inline void set_bit(int nr, unsigned long *addr)
{
addr[nr / BITS_PER_LONG] |= 1UL << (nr % BITS_PER_LONG);
@ -30,4 +41,111 @@ static inline unsigned long hweight_long(unsigned long w)
return sizeof(w) == 4 ? hweight32(w) : hweight64(w);
}
#define BITOP_WORD(nr) ((nr) / BITS_PER_LONG)
/**
* __ffs - find first bit in word.
* @word: The word to search
*
* Undefined if no bit exists, so code should check against 0 first.
*/
static __always_inline unsigned long __ffs(unsigned long word)
{
int num = 0;
#if BITS_PER_LONG == 64
if ((word & 0xffffffff) == 0) {
num += 32;
word >>= 32;
}
#endif
if ((word & 0xffff) == 0) {
num += 16;
word >>= 16;
}
if ((word & 0xff) == 0) {
num += 8;
word >>= 8;
}
if ((word & 0xf) == 0) {
num += 4;
word >>= 4;
}
if ((word & 0x3) == 0) {
num += 2;
word >>= 2;
}
if ((word & 0x1) == 0)
num += 1;
return num;
}
/*
* Find the first set bit in a memory region.
*/
static inline unsigned long
find_first_bit(const unsigned long *addr, unsigned long size)
{
const unsigned long *p = addr;
unsigned long result = 0;
unsigned long tmp;
while (size & ~(BITS_PER_LONG-1)) {
if ((tmp = *(p++)))
goto found;
result += BITS_PER_LONG;
size -= BITS_PER_LONG;
}
if (!size)
return result;
tmp = (*p) & (~0UL >> (BITS_PER_LONG - size));
if (tmp == 0UL) /* Are any bits set? */
return result + size; /* Nope. */
found:
return result + __ffs(tmp);
}
/*
* Find the next set bit in a memory region.
*/
static inline unsigned long
find_next_bit(const unsigned long *addr, unsigned long size, unsigned long offset)
{
const unsigned long *p = addr + BITOP_WORD(offset);
unsigned long result = offset & ~(BITS_PER_LONG-1);
unsigned long tmp;
if (offset >= size)
return size;
size -= result;
offset %= BITS_PER_LONG;
if (offset) {
tmp = *(p++);
tmp &= (~0UL << offset);
if (size < BITS_PER_LONG)
goto found_first;
if (tmp)
goto found_middle;
size -= BITS_PER_LONG;
result += BITS_PER_LONG;
}
while (size & ~(BITS_PER_LONG-1)) {
if ((tmp = *(p++)))
goto found_middle;
result += BITS_PER_LONG;
size -= BITS_PER_LONG;
}
if (!size)
return result;
tmp = *p;
found_first:
tmp &= (~0UL >> (BITS_PER_LONG - size));
if (tmp == 0UL) /* Are any bits set? */
return result + size; /* Nope. */
found_middle:
return result + __ffs(tmp);
}
#endif