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perf session: Use sensible mmap size 

On 64bit we can map the whole file in one go, on 32bit we can at least map
32MB and not map/unmap tiny chunks of the file.

Base the progress bar on 1/16 of the data size.

Preparatory patch to get rid of the malloc/memcpy/free of trace data.

Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <20101130163820.213687773@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Thomas Gleixner 2010-11-30 17:49:46 +00:00 committed by Arnaldo Carvalho de Melo
parent d6513281c5
commit 55b44629f5
1 changed files with 29 additions and 12 deletions
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41
tools/perf/util/session.c
View File

@ -101,7 +101,15 @@ struct perf_session *perf_session__new(const char *filename, int mode, bool forc
INIT_LIST_HEAD(&self->dead_threads);
self->hists_tree = RB_ROOT;
self->last_match = NULL;
self->mmap_window = 32;
/*
* On 64bit we can mmap the data file in one go. No need for tiny mmap
* slices. On 32bit we use 32MB.
*/
#if BITS_PER_LONG == 64
self->mmap_window = ULLONG_MAX;
#else
self->mmap_window = 32 * 1024 * 1024ULL;
#endif
self->machines = RB_ROOT;
self->repipe = repipe;
INIT_LIST_HEAD(&self->ordered_samples.samples);
@ -738,18 +746,14 @@ 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, file_pos;
u64 head, page_offset, file_offset, file_pos, progress_next;
int err, mmap_prot, mmap_flags;
struct ui_progress *progress;
size_t page_size;
size_t page_size, mmap_size;
event_t *event;
uint32_t size;
char *buf;
progress = ui_progress__new("Processing events...", session->size);
if (progress == NULL)
return -1;
perf_event_ops__fill_defaults(ops);
page_size = sysconf(_SC_PAGESIZE);
@ -761,6 +765,15 @@ int __perf_session__process_events(struct perf_session *session,
if (data_offset + data_size < file_size)
file_size = data_offset + data_size;
progress_next = file_size / 16;
progress = ui_progress__new("Processing events...", file_size);
if (progress == NULL)
return -1;
mmap_size = session->mmap_window;
if (mmap_size > file_size)
mmap_size = file_size;
mmap_prot = PROT_READ;
mmap_flags = MAP_SHARED;
@ -769,15 +782,14 @@ int __perf_session__process_events(struct perf_session *session,
mmap_flags = MAP_PRIVATE;
}
remap:
buf = mmap(NULL, page_size * session->mmap_window, mmap_prot,
mmap_flags, session->fd, file_offset);
buf = mmap(NULL, mmap_size, mmap_prot, mmap_flags, session->fd,
file_offset);
if (buf == MAP_FAILED) {
pr_err("failed to mmap file\n");
err = -errno;
goto out_err;
}
file_pos = file_offset + head;
ui_progress__update(progress, file_offset);
more:
event = (event_t *)(buf + head);
@ -788,10 +800,10 @@ more:
if (size == 0)
size = 8;
if (head + event->header.size >= page_size * session->mmap_window) {
if (head + event->header.size >= mmap_size) {
int munmap_ret;
munmap_ret = munmap(buf, page_size * session->mmap_window);
munmap_ret = munmap(buf, mmap_size);
assert(munmap_ret == 0);
page_offset = page_size * (head / page_size);
@ -823,6 +835,11 @@ more:
head += size;
file_pos += size;
if (file_pos >= progress_next) {
progress_next += file_size / 16;
ui_progress__update(progress, file_pos);
}
if (file_pos < file_size)
goto more;