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ANDROID: fs: FS tracepoints to track IO.

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Adds tracepoints in ext4/f2fs/mpage to track readpages/buffered
write()s. This allows us to track files that are being read/written
to PIDs.

Bug: 120445624
Change-Id: I44476230324e9397e292328463f846af4befbd6d
[joelaf: Needed for storaged fsync accounting ("storaged --uid" and
         "storaged --task".)]
Signed-off-by: Mohan Srinivasan <[email protected]>
[AmitP: Folded following android-4.9 commit changes into this patch
        a5c4dbb05ab7 ("ANDROID: Replace spaces by '_' for some
        android filesystem tracepoints.")]
Signed-off-by: Amit Pundir <[email protected]>
[astrachan: Folded 63066f4acf92 ("ANDROID: fs: Refactor FS
            readpage/write tracepoints.") into this patch
Signed-off-by: Alistair Strachan <[email protected]>
This commit is contained in:
Mohan Srinivasan 2016-12-14 16:39:51 -08:00 • committed by Todd Kjos
commit f2fe7bac26
8 changed files with 337 additions and 4 deletions
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36
fs/mpage.c
View file

@ -32,6 +32,14 @@
#include <linux/cleancache.h>
#include "internal.h"
#define CREATE_TRACE_POINTS
#include <trace/events/android_fs.h>
EXPORT_TRACEPOINT_SYMBOL(android_fs_datawrite_start);
EXPORT_TRACEPOINT_SYMBOL(android_fs_datawrite_end);
EXPORT_TRACEPOINT_SYMBOL(android_fs_dataread_start);
EXPORT_TRACEPOINT_SYMBOL(android_fs_dataread_end);
/*
* I/O completion handler for multipage BIOs.
*
@ -49,6 +57,16 @@ static void mpage_end_io(struct bio *bio)
struct bio_vec *bv;
int i;
if (trace_android_fs_dataread_end_enabled() &&
(bio_data_dir(bio) == READ)) {
struct page *first_page = bio->bi_io_vec[0].bv_page;
if (first_page != NULL)
trace_android_fs_dataread_end(first_page->mapping->host,
page_offset(first_page),
bio->bi_iter.bi_size);
}
bio_for_each_segment_all(bv, bio, i) {
struct page *page = bv->bv_page;
page_endio(page, bio_op(bio),
@ -60,6 +78,24 @@ static void mpage_end_io(struct bio *bio)
static struct bio *mpage_bio_submit(int op, int op_flags, struct bio *bio)
{
if (trace_android_fs_dataread_start_enabled() && (op == REQ_OP_READ)) {
struct page *first_page = bio->bi_io_vec[0].bv_page;
if (first_page != NULL) {
char *path, pathbuf[MAX_TRACE_PATHBUF_LEN];
path = android_fstrace_get_pathname(pathbuf,
MAX_TRACE_PATHBUF_LEN,
first_page->mapping->host);
trace_android_fs_dataread_start(
first_page->mapping->host,
page_offset(first_page),
bio->bi_iter.bi_size,
current->pid,
path,
current->comm);
}
}
bio->bi_end_io = mpage_end_io;
bio_set_op_attrs(bio, op, op_flags);
guard_bio_eod(op, bio);