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perf session: Cleanup __perf_session__process_events()
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Replace the pseudo C++ self argument with session and give the mmap related
variables a sensible name. shift is a complete misnomer - it took me several
rounds of cursing to figure out that it's not a shift value.

Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <20101130163820.029687218@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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Thomas Gleixner authored and Arnaldo Carvalho de Melo committed Nov 30, 2010
1 parent 28990f7 commit 0331ee0
Showing 1 changed file with 37 additions and 40 deletions.
77 changes: 37 additions & 40 deletions tools/perf/util/session.c
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Original file line number Diff line number Diff line change
Expand Up @@ -567,13 +567,13 @@ static int perf_session__process_sample(event_t *event, struct perf_session *s,
static int perf_session__process_event(struct perf_session *self,
event_t *event,
struct perf_event_ops *ops,
u64 offset, u64 head)
u64 file_offset)
{
trace_event(event);

if (event->header.type < PERF_RECORD_HEADER_MAX) {
dump_printf("%#Lx [%#x]: PERF_RECORD_%s",
offset + head, event->header.size,
file_offset, event->header.size,
event__name[event->header.type]);
hists__inc_nr_events(&self->hists, event->header.type);
}
Expand Down Expand Up @@ -606,7 +606,7 @@ static int perf_session__process_event(struct perf_session *self,
return ops->event_type(event, self);
case PERF_RECORD_HEADER_TRACING_DATA:
/* setup for reading amidst mmap */
lseek(self->fd, offset + head, SEEK_SET);
lseek(self->fd, file_offset, SEEK_SET);
return ops->tracing_data(event, self);
case PERF_RECORD_HEADER_BUILD_ID:
return ops->build_id(event, self);
Expand Down Expand Up @@ -705,8 +705,7 @@ static int __perf_session__process_pipe_events(struct perf_session *self,
}

if (size == 0 ||
(skip = perf_session__process_event(self, &event, ops,
0, head)) < 0) {
(skip = perf_session__process_event(self, &event, ops, head)) < 0) {
dump_printf("%#Lx [%#x]: skipping unknown header type: %d\n",
head, event.header.size, event.header.type);
/*
Expand Down Expand Up @@ -735,41 +734,40 @@ static int __perf_session__process_pipe_events(struct perf_session *self,
return err;
}

int __perf_session__process_events(struct perf_session *self,
int __perf_session__process_events(struct perf_session *session,
u64 data_offset, u64 data_size,
u64 file_size, struct perf_event_ops *ops)
{
u64 head, page_offset, file_offset;
int err, mmap_prot, mmap_flags;
u64 head, shift;
u64 offset = 0;
struct ui_progress *progress;
size_t page_size;
event_t *event;
uint32_t size;
char *buf;
struct ui_progress *progress = ui_progress__new("Processing events...",
self->size);

progress = ui_progress__new("Processing events...", session->size);
if (progress == NULL)
return -1;

perf_event_ops__fill_defaults(ops);

page_size = sysconf(_SC_PAGESIZE);

head = data_offset;
shift = page_size * (head / page_size);
offset += shift;
head -= shift;
page_offset = page_size * (data_offset / page_size);
file_offset = page_offset;
head = data_offset - page_offset;

mmap_prot = PROT_READ;
mmap_flags = MAP_SHARED;

if (self->header.needs_swap) {
if (session->header.needs_swap) {
mmap_prot |= PROT_WRITE;
mmap_flags = MAP_PRIVATE;
}
remap:
buf = mmap(NULL, page_size * self->mmap_window, mmap_prot,
mmap_flags, self->fd, offset);
buf = mmap(NULL, page_size * session->mmap_window, mmap_prot,
mmap_flags, session->fd, file_offset);
if (buf == MAP_FAILED) {
pr_err("failed to mmap file\n");
err = -errno;
Expand All @@ -778,36 +776,35 @@ int __perf_session__process_events(struct perf_session *self,

more:
event = (event_t *)(buf + head);
ui_progress__update(progress, offset);
ui_progress__update(progress, file_offset);

if (self->header.needs_swap)
if (session->header.needs_swap)
perf_event_header__bswap(&event->header);
size = event->header.size;
if (size == 0)
size = 8;

if (head + event->header.size >= page_size * self->mmap_window) {
if (head + event->header.size >= page_size * session->mmap_window) {
int munmap_ret;

shift = page_size * (head / page_size);

munmap_ret = munmap(buf, page_size * self->mmap_window);
munmap_ret = munmap(buf, page_size * session->mmap_window);
assert(munmap_ret == 0);

offset += shift;
head -= shift;
page_offset = page_size * (head / page_size);
file_offset += page_offset;
head -= page_offset;
goto remap;
}

size = event->header.size;

dump_printf("\n%#Lx [%#x]: event: %d\n",
offset + head, event->header.size, event->header.type);
file_offset + head, event->header.size, event->header.type);

if (size == 0 ||
perf_session__process_event(self, event, ops, offset, head) < 0) {
if (size == 0 || perf_session__process_event(session, event, ops,
file_offset + head) < 0) {
dump_printf("%#Lx [%#x]: skipping unknown header type: %d\n",
offset + head, event->header.size,
file_offset + head, event->header.size,
event->header.type);
/*
* assume we lost track of the stream, check alignment, and
Expand All @@ -821,36 +818,36 @@ int __perf_session__process_events(struct perf_session *self,

head += size;

if (offset + head >= data_offset + data_size)
if (file_offset + head >= data_offset + data_size)
goto done;

if (offset + head < file_size)
if (file_offset + head < file_size)
goto more;
done:
err = 0;
/* do the final flush for ordered samples */
self->ordered_samples.next_flush = ULLONG_MAX;
flush_sample_queue(self, ops);
session->ordered_samples.next_flush = ULLONG_MAX;
flush_sample_queue(session, ops);
out_err:
ui_progress__delete(progress);

if (ops->lost == event__process_lost &&
self->hists.stats.total_lost != 0) {
session->hists.stats.total_lost != 0) {
ui__warning("Processed %Lu events and LOST %Lu!\n\n"
"Check IO/CPU overload!\n\n",
self->hists.stats.total_period,
self->hists.stats.total_lost);
session->hists.stats.total_period,
session->hists.stats.total_lost);
}
if (self->hists.stats.nr_unknown_events != 0) {

if (session->hists.stats.nr_unknown_events != 0) {
ui__warning("Found %u unknown events!\n\n"
"Is this an older tool processing a perf.data "
"file generated by a more recent tool?\n\n"
"If that is not the case, consider "
"reporting to linux-kernel@vger.kernel.org.\n\n",
self->hists.stats.nr_unknown_events);
session->hists.stats.nr_unknown_events);
}

return err;
}

Expand Down

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