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authorRitesh Harjani (IBM) <ritesh.list@gmail.com>2023-04-21 08:52:43 -0700
committerDarrick J. Wong <djwong@kernel.org>2023-04-21 08:54:47 -0700
commit3fd41721cd5c30af37c860e6201c98db0a568fd2 (patch)
tree126f0d2cce406dc015593ff4687dee07c7a1a17e /fs
parentd3bff1fc50d4fcaccddbd63917dd94172e80c40e (diff)
iomap: Add DIO tracepoints
Add trace_iomap_dio_rw_begin, trace_iomap_dio_rw_queued and trace_iomap_dio_complete tracepoint. trace_iomap_dio_rw_queued is mostly only to know that the request was queued and -EIOCBQUEUED was returned. It is mostly trace_iomap_dio_rw_begin & trace_iomap_dio_complete which has all the details. <example output log> a.out-2073 [006] 134.225717: iomap_dio_rw_begin: dev 7:7 ino 0xe size 0x0 offset 0x0 length 0x1000 done_before 0x0 flags DIRECT|WRITE dio_flags DIO_FORCE_WAIT aio 1 a.out-2073 [006] 134.226234: iomap_dio_complete: dev 7:7 ino 0xe size 0x1000 offset 0x1000 flags DIRECT|WRITE aio 1 error 0 ret 4096 a.out-2074 [006] 136.225975: iomap_dio_rw_begin: dev 7:7 ino 0xe size 0x1000 offset 0x0 length 0x1000 done_before 0x0 flags DIRECT dio_flags aio 1 a.out-2074 [006] 136.226173: iomap_dio_rw_queued: dev 7:7 ino 0xe size 0x1000 offset 0x1000 length 0x0 ksoftirqd/3-31 [003] 136.226389: iomap_dio_complete: dev 7:7 ino 0xe size 0x1000 offset 0x1000 flags DIRECT aio 1 error 0 ret 4096 a.out-2075 [003] 141.674969: iomap_dio_rw_begin: dev 7:7 ino 0xe size 0x1000 offset 0x0 length 0x1000 done_before 0x0 flags DIRECT|WRITE dio_flags aio 1 a.out-2075 [003] 141.676085: iomap_dio_rw_queued: dev 7:7 ino 0xe size 0x1000 offset 0x1000 length 0x0 kworker/2:0-27 [002] 141.676432: iomap_dio_complete: dev 7:7 ino 0xe size 0x1000 offset 0x1000 flags DIRECT|WRITE aio 1 error 0 ret 4096 a.out-2077 [006] 143.443746: iomap_dio_rw_begin: dev 7:7 ino 0xe size 0x1000 offset 0x0 length 0x1000 done_before 0x0 flags DIRECT dio_flags aio 1 a.out-2077 [006] 143.443866: iomap_dio_rw_queued: dev 7:7 ino 0xe size 0x1000 offset 0x1000 length 0x0 ksoftirqd/5-41 [005] 143.444134: iomap_dio_complete: dev 7:7 ino 0xe size 0x1000 offset 0x1000 flags DIRECT aio 1 error 0 ret 4096 a.out-2078 [007] 146.716833: iomap_dio_rw_begin: dev 7:7 ino 0xe size 0x1000 offset 0x0 length 0x1000 done_before 0x0 flags DIRECT dio_flags aio 0 a.out-2078 [007] 146.717639: iomap_dio_complete: dev 7:7 ino 0xe size 0x1000 offset 0x1000 flags DIRECT aio 0 error 0 ret 4096 a.out-2079 [006] 148.972605: iomap_dio_rw_begin: dev 7:7 ino 0xe size 0x1000 offset 0x0 length 0x1000 done_before 0x0 flags DIRECT dio_flags aio 0 a.out-2079 [006] 148.973099: iomap_dio_complete: dev 7:7 ino 0xe size 0x1000 offset 0x1000 flags DIRECT aio 0 error 0 ret 4096 Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com> Reviewed-by: Darrick J. Wong <djwong@kernel.org> [djwong: line up strings all prettylike] Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Diffstat (limited to 'fs')
-rw-r--r--fs/iomap/direct-io.c7
-rw-r--r--fs/iomap/trace.c1
-rw-r--r--fs/iomap/trace.h78
3 files changed, 85 insertions, 1 deletions
diff --git a/fs/iomap/direct-io.c b/fs/iomap/direct-io.c
index 36ab1152dbea..019cc87d0fb3 100644
--- a/fs/iomap/direct-io.c
+++ b/fs/iomap/direct-io.c
@@ -130,6 +130,7 @@ ssize_t iomap_dio_complete(struct iomap_dio *dio)
if (ret > 0)
ret += dio->done_before;
+ trace_iomap_dio_complete(iocb, dio->error, ret);
kfree(dio);
return ret;
@@ -493,6 +494,8 @@ __iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter,
struct blk_plug plug;
struct iomap_dio *dio;
+ trace_iomap_dio_rw_begin(iocb, iter, dio_flags, done_before);
+
if (!iomi.len)
return NULL;
@@ -650,8 +653,10 @@ __iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter,
*/
dio->wait_for_completion = wait_for_completion;
if (!atomic_dec_and_test(&dio->ref)) {
- if (!wait_for_completion)
+ if (!wait_for_completion) {
+ trace_iomap_dio_rw_queued(inode, iomi.pos, iomi.len);
return ERR_PTR(-EIOCBQUEUED);
+ }
for (;;) {
set_current_state(TASK_UNINTERRUPTIBLE);
diff --git a/fs/iomap/trace.c b/fs/iomap/trace.c
index da217246b1a9..728d5443daf5 100644
--- a/fs/iomap/trace.c
+++ b/fs/iomap/trace.c
@@ -3,6 +3,7 @@
* Copyright (c) 2019 Christoph Hellwig
*/
#include <linux/iomap.h>
+#include <linux/uio.h>
/*
* We include this last to have the helpers above available for the trace
diff --git a/fs/iomap/trace.h b/fs/iomap/trace.h
index f6ea9540d082..c16fd55f5595 100644
--- a/fs/iomap/trace.h
+++ b/fs/iomap/trace.h
@@ -83,6 +83,7 @@ DEFINE_RANGE_EVENT(iomap_writepage);
DEFINE_RANGE_EVENT(iomap_release_folio);
DEFINE_RANGE_EVENT(iomap_invalidate_folio);
DEFINE_RANGE_EVENT(iomap_dio_invalidate_fail);
+DEFINE_RANGE_EVENT(iomap_dio_rw_queued);
#define IOMAP_TYPE_STRINGS \
{ IOMAP_HOLE, "HOLE" }, \
@@ -107,6 +108,11 @@ DEFINE_RANGE_EVENT(iomap_dio_invalidate_fail);
{ IOMAP_F_BUFFER_HEAD, "BH" }, \
{ IOMAP_F_SIZE_CHANGED, "SIZE_CHANGED" }
+#define IOMAP_DIO_STRINGS \
+ {IOMAP_DIO_FORCE_WAIT, "DIO_FORCE_WAIT" }, \
+ {IOMAP_DIO_OVERWRITE_ONLY, "DIO_OVERWRITE_ONLY" }, \
+ {IOMAP_DIO_PARTIAL, "DIO_PARTIAL" }
+
DECLARE_EVENT_CLASS(iomap_class,
TP_PROTO(struct inode *inode, struct iomap *iomap),
TP_ARGS(inode, iomap),
@@ -183,6 +189,78 @@ TRACE_EVENT(iomap_iter,
(void *)__entry->caller)
);
+TRACE_EVENT(iomap_dio_rw_begin,
+ TP_PROTO(struct kiocb *iocb, struct iov_iter *iter,
+ unsigned int dio_flags, size_t done_before),
+ TP_ARGS(iocb, iter, dio_flags, done_before),
+ TP_STRUCT__entry(
+ __field(dev_t, dev)
+ __field(ino_t, ino)
+ __field(loff_t, isize)
+ __field(loff_t, pos)
+ __field(size_t, count)
+ __field(size_t, done_before)
+ __field(int, ki_flags)
+ __field(unsigned int, dio_flags)
+ __field(bool, aio)
+ ),
+ TP_fast_assign(
+ __entry->dev = file_inode(iocb->ki_filp)->i_sb->s_dev;
+ __entry->ino = file_inode(iocb->ki_filp)->i_ino;
+ __entry->isize = file_inode(iocb->ki_filp)->i_size;
+ __entry->pos = iocb->ki_pos;
+ __entry->count = iov_iter_count(iter);
+ __entry->done_before = done_before;
+ __entry->ki_flags = iocb->ki_flags;
+ __entry->dio_flags = dio_flags;
+ __entry->aio = !is_sync_kiocb(iocb);
+ ),
+ TP_printk("dev %d:%d ino 0x%lx size 0x%llx offset 0x%llx length 0x%zx done_before 0x%zx flags %s dio_flags %s aio %d",
+ MAJOR(__entry->dev), MINOR(__entry->dev),
+ __entry->ino,
+ __entry->isize,
+ __entry->pos,
+ __entry->count,
+ __entry->done_before,
+ __print_flags(__entry->ki_flags, "|", TRACE_IOCB_STRINGS),
+ __print_flags(__entry->dio_flags, "|", IOMAP_DIO_STRINGS),
+ __entry->aio)
+);
+
+TRACE_EVENT(iomap_dio_complete,
+ TP_PROTO(struct kiocb *iocb, int error, ssize_t ret),
+ TP_ARGS(iocb, error, ret),
+ TP_STRUCT__entry(
+ __field(dev_t, dev)
+ __field(ino_t, ino)
+ __field(loff_t, isize)
+ __field(loff_t, pos)
+ __field(int, ki_flags)
+ __field(bool, aio)
+ __field(int, error)
+ __field(ssize_t, ret)
+ ),
+ TP_fast_assign(
+ __entry->dev = file_inode(iocb->ki_filp)->i_sb->s_dev;
+ __entry->ino = file_inode(iocb->ki_filp)->i_ino;
+ __entry->isize = file_inode(iocb->ki_filp)->i_size;
+ __entry->pos = iocb->ki_pos;
+ __entry->ki_flags = iocb->ki_flags;
+ __entry->aio = !is_sync_kiocb(iocb);
+ __entry->error = error;
+ __entry->ret = ret;
+ ),
+ TP_printk("dev %d:%d ino 0x%lx size 0x%llx offset 0x%llx flags %s aio %d error %d ret %zd",
+ MAJOR(__entry->dev), MINOR(__entry->dev),
+ __entry->ino,
+ __entry->isize,
+ __entry->pos,
+ __print_flags(__entry->ki_flags, "|", TRACE_IOCB_STRINGS),
+ __entry->aio,
+ __entry->error,
+ __entry->ret)
+);
+
#endif /* _IOMAP_TRACE_H */
#undef TRACE_INCLUDE_PATH