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Message-ID: <20230414021601.GE360877@frogsfrogsfrogs>
Date: Thu, 13 Apr 2023 19:16:01 -0700
From: "Darrick J. Wong" <djwong@...nel.org>
To: Ritesh Harjani <ritesh.list@...il.com>
Cc: linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
Jan Kara <jack@...e.cz>, Christoph Hellwig <hch@...radead.org>,
Ojaswin Mujoo <ojaswin@...ux.ibm.com>,
Disha Goel <disgoel@...ux.ibm.com>
Subject: Re: [RFCv3 10/10] iomap: Add trace points for DIO path
On Fri, Apr 14, 2023 at 01:48:49AM +0530, Ritesh Harjani wrote:
> "Darrick J. Wong" <djwong@...nel.org> writes:
>
> > On Thu, Apr 13, 2023 at 02:10:32PM +0530, Ritesh Harjani (IBM) wrote:
> >> This patch adds trace point events for iomap DIO path.
> >>
> >> <e.g. iomap dio trace>
> >> xfs_io-8815 [000] 526.790418: iomap_dio_rw_begin: dev 7:7 ino 0xc isize 0x0 pos 0x0 count 4096 flags DIRECT dio_flags DIO_FORCE_WAIT done_before 0 aio 0 ret 0
> >> xfs_io-8815 [000] 526.790978: iomap_dio_complete: dev 7:7 ino 0xc isize 0x1000 pos 0x1000 flags DIRECT aio 0 error 0 ret 4096
> >> xfs_io-8815 [000] 526.790988: iomap_dio_rw_end: dev 7:7 ino 0xc isize 0x1000 pos 0x1000 count 0 flags DIRECT dio_flags DIO_FORCE_WAIT done_before 0 aio 0 ret 4096
> >> fsx-8827 [005] 526.939345: iomap_dio_rw_begin: dev 7:7 ino 0xc isize 0x922f8 pos 0x4f000 count 61440 flags NOWAIT|DIRECT|ALLOC_CACHE dio_flags done_before 0 aio 1 ret 0
> >> fsx-8827 [005] 526.939459: iomap_dio_rw_end: dev 7:7 ino 0xc isize 0x922f8 pos 0x4f000 count 0 flags NOWAIT|DIRECT|ALLOC_CACHE dio_flags done_before 0 aio 1 ret -529
> >> ksoftirqd/5-41 [005] 526.939564: iomap_dio_complete: dev 7:7 ino 0xc isize 0x922f8 pos 0x5e000 flags NOWAIT|DIRECT|ALLOC_CACHE aio 1 error 0 ret 61440
> >>
> >> Tested-by: Disha Goel <disgoel@...ux.ibm.com>
> >> Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@...il.com>
> >> ---
> >> fs/iomap/direct-io.c | 3 ++
> >> fs/iomap/trace.c | 1 +
> >> fs/iomap/trace.h | 90 ++++++++++++++++++++++++++++++++++++++++++++
> >> 3 files changed, 94 insertions(+)
> >>
> >> diff --git a/fs/iomap/direct-io.c b/fs/iomap/direct-io.c
> >> index 5871956ee880..bb7a6dfbc8b3 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;
> >> @@ -681,6 +682,7 @@ iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter,
> >> struct iomap_dio *dio;
> >> ssize_t ret = 0;
> >>
> >> + trace_iomap_dio_rw_begin(iocb, iter, dio_flags, done_before, ret);
> >> dio = __iomap_dio_rw(iocb, iter, ops, dops, dio_flags, private,
> >> done_before);
> >> if (IS_ERR_OR_NULL(dio)) {
> >> @@ -689,6 +691,7 @@ iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter,
> >> }
> >> ret = iomap_dio_complete(dio);
> >> out:
> >> + trace_iomap_dio_rw_end(iocb, iter, dio_flags, done_before, ret);
> >> return ret;
> >> }
> >> EXPORT_SYMBOL_GPL(iomap_dio_rw);
> >> 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..dcb4dd4db5fb 100644
> >> --- a/fs/iomap/trace.h
> >> +++ b/fs/iomap/trace.h
> >> @@ -183,6 +183,96 @@ TRACE_EVENT(iomap_iter,
> >> (void *)__entry->caller)
> >> );
> >>
> >> +#define TRACE_IOMAP_DIO_STRINGS \
> >> + {IOMAP_DIO_FORCE_WAIT, "DIO_FORCE_WAIT" }, \
> >> + {IOMAP_DIO_OVERWRITE_ONLY, "DIO_OVERWRITE_ONLY" }, \
> >> + {IOMAP_DIO_PARTIAL, "DIO_PARTIAL" }
> >
> > Can you make the strings line up too, please?
> >
>
> Ok near other _STRINGS macro. Sure, will do that.
>
>
> >> +
> >> +DECLARE_EVENT_CLASS(iomap_dio_class,
> >> + TP_PROTO(struct kiocb *iocb, struct iov_iter *iter,
> >> + unsigned int dio_flags, u64 done_before, int ret),
> >
> > We're passing in ssize_t values for @ret, shouldn't the types match?
> >
>
> Yes, I missed to correct that. Will make it loff_t.
> This should be fixed in ext2 trace point macro too.
>
> (ssize_t can vary based on 32 bit v/s 64 bit, so while printing it as
> %llx it gives warning on 32bit. Hence will use loff_t for ret)
How about %zd?
--D
>
> >> + TP_ARGS(iocb, iter, dio_flags, done_before, ret),
> >> + TP_STRUCT__entry(
> >> + __field(dev_t, dev)
> >> + __field(ino_t, ino)
> >> + __field(loff_t, isize)
> >> + __field(loff_t, pos)
> >> + __field(u64, count)
> >
> > What's the difference between "length" as used in the other tracepoints
> > and "count" here?
> >
>
> Yup let me make it length which will be a more consistent naming.
> I chose count just because of (iov_iter_count(iter)).
>
> >> + __field(u64, done_before)
> >> + __field(int, ki_flags)
> >> + __field(unsigned int, dio_flags)
> >> + __field(bool, aio)
> >> + __field(int, 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->count = iov_iter_count(iter);
> >> + __entry->done_before = done_before;
> >> + __entry->dio_flags = dio_flags;
> >> + __entry->ki_flags = iocb->ki_flags;
> >> + __entry->aio = !is_sync_kiocb(iocb);
> >> + __entry->ret = ret;
> >> + ),
> >> + TP_printk("dev %d:%d ino 0x%lx isize 0x%llx pos 0x%llx count %llu "
> >
> > count and done_before are lengths of file operations, in bytes, right?
>
> Yes, that's right.
>
> >
> > Everywhere else we use 0x%llx for that.
> >
>
> Yup I had noticed that, but I guess I missed it.
> Thanks for catching it. I will fix it.
>
> >> + "flags %s dio_flags %s done_before %llu aio %d ret %d",
> >> + MAJOR(__entry->dev), MINOR(__entry->dev),
> >> + __entry->ino,
> >> + __entry->isize,
> >> + __entry->pos,
> >> + __entry->count,
> >> + __print_flags(__entry->ki_flags, "|", TRACE_IOCB_STRINGS),
> >> + __print_flags(__entry->dio_flags, "|", TRACE_IOMAP_DIO_STRINGS),
> >> + __entry->done_before,
> >> + __entry->aio,
> >> + __entry->ret)
> >> +)
> >> +
> >> +#define DEFINE_DIO_RW_EVENT(name) \
> >> +DEFINE_EVENT(iomap_dio_class, name, \
> >> + TP_PROTO(struct kiocb *iocb, struct iov_iter *iter, \
> >> + unsigned int dio_flags, u64 done_before, \
> >> + int ret), \
> >> + TP_ARGS(iocb, iter, dio_flags, done_before, ret))
> >> +DEFINE_DIO_RW_EVENT(iomap_dio_rw_begin);
> >> +DEFINE_DIO_RW_EVENT(iomap_dio_rw_end);
> >> +
> >> +TRACE_EVENT(iomap_dio_complete,
> >> + TP_PROTO(struct kiocb *iocb, int error, int 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(int, ret)
> >
> > Same comment about @ret and ssize_t here.
>
> Got it.
>
> Thanks for the review!
> -ritesh
>
>
> >
> > --D
> >
> >> + ),
> >> + 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 isize 0x%llx pos 0x%llx flags %s aio %d error %d ret %d",
> >> + 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
> >> --
> >> 2.39.2
> >>
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