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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>
This commit is contained in:
Ritesh Harjani (IBM)
Darrick J. Wong
parent
d3bff1fc50
commit
3fd41721cd
@ -130,6 +130,7 @@ ssize_t iomap_dio_complete(struct iomap_dio *dio)
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if (ret > 0)
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ret += dio->done_before;
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trace_iomap_dio_complete(iocb, dio->error, ret);
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kfree(dio);
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return ret;
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@ -493,6 +494,8 @@ __iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter,
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struct blk_plug plug;
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struct iomap_dio *dio;
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trace_iomap_dio_rw_begin(iocb, iter, dio_flags, done_before);
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if (!iomi.len)
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return NULL;
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@ -650,8 +653,10 @@ __iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter,
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*/
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dio->wait_for_completion = wait_for_completion;
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if (!atomic_dec_and_test(&dio->ref)) {
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if (!wait_for_completion)
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if (!wait_for_completion) {
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trace_iomap_dio_rw_queued(inode, iomi.pos, iomi.len);
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return ERR_PTR(-EIOCBQUEUED);
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}
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for (;;) {
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set_current_state(TASK_UNINTERRUPTIBLE);
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@ -3,6 +3,7 @@
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* Copyright (c) 2019 Christoph Hellwig
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*/
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#include <linux/iomap.h>
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#include <linux/uio.h>
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/*
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* We include this last to have the helpers above available for the trace
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@ -83,6 +83,7 @@ DEFINE_RANGE_EVENT(iomap_writepage);
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DEFINE_RANGE_EVENT(iomap_release_folio);
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DEFINE_RANGE_EVENT(iomap_invalidate_folio);
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DEFINE_RANGE_EVENT(iomap_dio_invalidate_fail);
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DEFINE_RANGE_EVENT(iomap_dio_rw_queued);
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#define IOMAP_TYPE_STRINGS \
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{ IOMAP_HOLE, "HOLE" }, \
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@ -107,6 +108,11 @@ DEFINE_RANGE_EVENT(iomap_dio_invalidate_fail);
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{ IOMAP_F_BUFFER_HEAD, "BH" }, \
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{ IOMAP_F_SIZE_CHANGED, "SIZE_CHANGED" }
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#define IOMAP_DIO_STRINGS \
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{IOMAP_DIO_FORCE_WAIT, "DIO_FORCE_WAIT" }, \
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{IOMAP_DIO_OVERWRITE_ONLY, "DIO_OVERWRITE_ONLY" }, \
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{IOMAP_DIO_PARTIAL, "DIO_PARTIAL" }
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DECLARE_EVENT_CLASS(iomap_class,
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TP_PROTO(struct inode *inode, struct iomap *iomap),
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TP_ARGS(inode, iomap),
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@ -183,6 +189,78 @@ TRACE_EVENT(iomap_iter,
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(void *)__entry->caller)
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);
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TRACE_EVENT(iomap_dio_rw_begin,
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TP_PROTO(struct kiocb *iocb, struct iov_iter *iter,
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unsigned int dio_flags, size_t done_before),
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TP_ARGS(iocb, iter, dio_flags, done_before),
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TP_STRUCT__entry(
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__field(dev_t, dev)
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__field(ino_t, ino)
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__field(loff_t, isize)
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__field(loff_t, pos)
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__field(size_t, count)
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__field(size_t, done_before)
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__field(int, ki_flags)
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__field(unsigned int, dio_flags)
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__field(bool, aio)
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),
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TP_fast_assign(
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__entry->dev = file_inode(iocb->ki_filp)->i_sb->s_dev;
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__entry->ino = file_inode(iocb->ki_filp)->i_ino;
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__entry->isize = file_inode(iocb->ki_filp)->i_size;
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__entry->pos = iocb->ki_pos;
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__entry->count = iov_iter_count(iter);
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__entry->done_before = done_before;
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__entry->ki_flags = iocb->ki_flags;
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__entry->dio_flags = dio_flags;
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__entry->aio = !is_sync_kiocb(iocb);
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),
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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",
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MAJOR(__entry->dev), MINOR(__entry->dev),
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__entry->ino,
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__entry->isize,
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__entry->pos,
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__entry->count,
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__entry->done_before,
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__print_flags(__entry->ki_flags, "|", TRACE_IOCB_STRINGS),
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__print_flags(__entry->dio_flags, "|", IOMAP_DIO_STRINGS),
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__entry->aio)
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);
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TRACE_EVENT(iomap_dio_complete,
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TP_PROTO(struct kiocb *iocb, int error, ssize_t ret),
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TP_ARGS(iocb, error, ret),
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TP_STRUCT__entry(
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__field(dev_t, dev)
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__field(ino_t, ino)
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__field(loff_t, isize)
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__field(loff_t, pos)
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__field(int, ki_flags)
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__field(bool, aio)
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__field(int, error)
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__field(ssize_t, ret)
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),
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TP_fast_assign(
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__entry->dev = file_inode(iocb->ki_filp)->i_sb->s_dev;
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__entry->ino = file_inode(iocb->ki_filp)->i_ino;
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__entry->isize = file_inode(iocb->ki_filp)->i_size;
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__entry->pos = iocb->ki_pos;
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__entry->ki_flags = iocb->ki_flags;
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__entry->aio = !is_sync_kiocb(iocb);
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__entry->error = error;
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__entry->ret = ret;
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),
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TP_printk("dev %d:%d ino 0x%lx size 0x%llx offset 0x%llx flags %s aio %d error %d ret %zd",
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MAJOR(__entry->dev), MINOR(__entry->dev),
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__entry->ino,
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__entry->isize,
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__entry->pos,
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__print_flags(__entry->ki_flags, "|", TRACE_IOCB_STRINGS),
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__entry->aio,
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__entry->error,
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__entry->ret)
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);
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#endif /* _IOMAP_TRACE_H */
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#undef TRACE_INCLUDE_PATH
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