From 0331ee0cf4187dcdc2b184cf701d8b58bf9ff637 Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Tue, 30 Nov 2010 17:49:38 +0000 Subject: perf session: Cleanup __perf_session__process_events() 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 Cc: Peter Zijlstra Cc: Frederic Weisbecker LKML-Reference: <20101130163820.029687218@linutronix.de> Signed-off-by: Thomas Gleixner Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/session.c | 77 +++++++++++++++++++++++------------------------ 1 file changed, 37 insertions(+), 40 deletions(-) (limited to 'tools') diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c index 525bcf6adc21..2fdbccf10770 100644 --- a/tools/perf/util/session.c +++ b/tools/perf/util/session.c @@ -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); } @@ -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); @@ -705,8 +705,7 @@ more: } 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); /* @@ -735,19 +734,19 @@ out_err: 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; @@ -755,21 +754,20 @@ int __perf_session__process_events(struct perf_session *self, 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; @@ -778,36 +776,35 @@ remap: 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 @@ -821,36 +818,36 @@ more: 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; } -- cgit v1.2.3