ANDROID: fs: FS tracepoints to track IO.
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. (Merged from android4.4-common).
Signed-off-by: Mohan Srinivasan <srmohan@google.com>
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 9ae194f..06a0d9c 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -28,6 +28,7 @@
#include "segment.h"
#include "trace.h"
#include <trace/events/f2fs.h>
+#include <trace/events/android_fs.h>
static void f2fs_read_end_io(struct bio *bio)
{
@@ -1606,6 +1607,8 @@
block_t blkaddr = NULL_ADDR;
int err = 0;
+ trace_android_fs_datawrite_start(inode, pos, len,
+ current->pid, current->comm);
trace_f2fs_write_begin(inode, pos, len, flags);
/*
@@ -1697,6 +1700,7 @@
{
struct inode *inode = page->mapping->host;
+ trace_android_fs_datawrite_end(inode, pos, len);
trace_f2fs_write_end(inode, pos, len, copied);
/*
@@ -1758,6 +1762,16 @@
trace_f2fs_direct_IO_enter(inode, offset, count, rw);
+ if (trace_android_fs_dataread_start_enabled() &&
+ (rw == READ))
+ trace_android_fs_dataread_start(inode, offset,
+ count, current->pid,
+ current->comm);
+ if (trace_android_fs_datawrite_start_enabled() &&
+ (rw == WRITE))
+ trace_android_fs_datawrite_start(inode, offset, count,
+ current->pid, current->comm);
+
down_read(&F2FS_I(inode)->dio_rwsem[rw]);
err = blockdev_direct_IO(iocb, inode, iter, get_data_block_dio);
up_read(&F2FS_I(inode)->dio_rwsem[rw]);
@@ -1769,6 +1783,13 @@
f2fs_write_failed(mapping, offset + count);
}
+ if (trace_android_fs_dataread_start_enabled() &&
+ (rw == READ))
+ trace_android_fs_dataread_end(inode, offset, count);
+ if (trace_android_fs_datawrite_start_enabled() &&
+ (rw == WRITE))
+ trace_android_fs_datawrite_end(inode, offset, count);
+
trace_f2fs_direct_IO_exit(inode, offset, count, rw, err);
return err;