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

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Date:   Tue, 1 Oct 2019 11:23:04 -0400
From:   Brian Foster <bfoster@...hat.com>
To:     Christoph Hellwig <hch@....de>
Cc:     "Darrick J . Wong" <darrick.wong@...cle.com>,
        Damien Le Moal <Damien.LeMoal@....com>,
        Andreas Gruenbacher <agruenba@...hat.com>,
        linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/11] iomap: add tracing for the readpage / readpages

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@....de>
> ---
>  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
>