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/ext4/inode.c b/fs/ext4/inode.c
index 9c06472..852b179 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -44,6 +44,7 @@
#include "truncate.h"
#include <trace/events/ext4.h>
+#include <trace/events/android_fs.h>
#define MPAGE_DA_EXTENT_TAIL 0x01
@@ -1183,6 +1184,8 @@
pgoff_t index;
unsigned from, to;
+ trace_android_fs_datawrite_start(inode, pos, len,
+ current->pid, current->comm);
trace_ext4_write_begin(inode, pos, len, flags);
/*
* Reserve one block more for addition to orphan list in case
@@ -1320,6 +1323,7 @@
int ret = 0, ret2;
int i_size_changed = 0;
+ trace_android_fs_datawrite_end(inode, pos, len);
trace_ext4_write_end(inode, pos, len, copied);
if (ext4_has_inline_data(inode)) {
ret = ext4_write_inline_data_end(inode, pos, len,
@@ -1419,6 +1423,7 @@
unsigned from, to;
int size_changed = 0;
+ trace_android_fs_datawrite_end(inode, pos, len);
trace_ext4_journalled_write_end(inode, pos, len, copied);
from = pos & (PAGE_SIZE - 1);
to = from + len;
@@ -2897,6 +2902,8 @@
len, flags, pagep, fsdata);
}
*fsdata = (void *)0;
+ trace_android_fs_datawrite_start(inode, pos, len,
+ current->pid, current->comm);
trace_ext4_da_write_begin(inode, pos, len, flags);
if (ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) {
@@ -3015,6 +3022,7 @@
return ext4_write_end(file, mapping, pos,
len, copied, page, fsdata);
+ trace_android_fs_datawrite_end(inode, pos, len);
trace_ext4_da_write_end(inode, pos, len, copied);
start = pos & (PAGE_SIZE - 1);
end = start + copied - 1;
@@ -3571,6 +3579,7 @@
size_t count = iov_iter_count(iter);
loff_t offset = iocb->ki_pos;
ssize_t ret;
+ int rw = iov_iter_rw(iter);
#ifdef CONFIG_EXT4_FS_ENCRYPTION
if (ext4_encrypted_inode(inode) && S_ISREG(inode->i_mode))
@@ -3587,12 +3596,31 @@
if (ext4_has_inline_data(inode))
return 0;
+ 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);
+
trace_ext4_direct_IO_enter(inode, offset, count, iov_iter_rw(iter));
if (iov_iter_rw(iter) == READ)
ret = ext4_direct_IO_read(iocb, iter);
else
ret = ext4_direct_IO_write(iocb, iter);
trace_ext4_direct_IO_exit(inode, offset, count, iov_iter_rw(iter), ret);
+
+ 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);
+
return ret;
}