Re: [PATCH 01/11] iomap: add tracing for the readpage / readpages

From: Brian Foster
Date: Tue Oct 01 2019 - 11:23:08 EST


On Tue, Oct 01, 2019 at 09:11:42AM +0200, Christoph Hellwig wrote:
> Lift the xfs code for tracing address space operations to the iomap
> layer.
>
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>
> ---
> fs/iomap/buffered-io.c | 7 +++++++
> include/trace/events/iomap.h | 27 +++++++++++++++++++++++++++
> 2 files changed, 34 insertions(+)
> create mode 100644 include/trace/events/iomap.h
>
...
> diff --git a/include/trace/events/iomap.h b/include/trace/events/iomap.h
> new file mode 100644
> index 000000000000..7d2fe2c773f3
> --- /dev/null
> +++ b/include/trace/events/iomap.h
> @@ -0,0 +1,27 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2009-2019, Christoph Hellwig
> + * All Rights Reserved.
> + *
> + * NOTE: none of these tracepoints shall be consider a stable kernel ABI
> + * as they can change at any time.
> + */
> +#undef TRACE_SYSTEM
> +#define TRACE_SYSTEM iomap
> +
> +#if !defined(_TRACE_IOMAP_H) || defined(TRACE_HEADER_MULTI_READ)
> +#define _TRACE_IOMAP_H
> +
> +#include <linux/tracepoint.h>
> +
> +#define DEFINE_READPAGE_EVENT(name) \
> +DEFINE_EVENT(iomap_readpage_class, name, \
> + TP_PROTO(struct inode *inode, int nr_pages), \
> + TP_ARGS(inode, nr_pages))

iomap_readpage_class isn't defined until the next patch. Commit mistake?

Brian

> +DEFINE_READPAGE_EVENT(iomap_readpage);
> +DEFINE_READPAGE_EVENT(iomap_readpages);
> +
> +#endif /* _TRACE_IOMAP_H */
> +
> +/* This part must be outside protection */
> +#include <trace/define_trace.h>
> --
> 2.20.1
>