linux-kernel - Re: [PATCH v3 1/1] binder: transaction latency tracking for user build

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Date:   Thu, 30 Apr 2020 10:50:10 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Frankie Chang <Frankie.Chang@...iatek.com>
Cc:     Todd Kjos <tkjos@...gle.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        Todd Kjos <tkjos@...roid.com>,
        Martijn Coenen <maco@...roid.com>,
        Arve Hjønnevåg <arve@...roid.com>,
        Christian Brauner <christian@...uner.io>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-mediatek@...ts.infradead.org,
        wsd_upstream <wsd_upstream@...iatek.com>,
        Jian-Min Liu <Jian-Min.Liu@...iatek.com>
Subject: Re: [PATCH v3 1/1] binder: transaction latency tracking for user
 build

On Thu, Apr 30, 2020 at 04:13:59PM +0800, Frankie Chang wrote:
> Record start/end timestamp for binder transaction.
> When transaction is completed or transaction is free,
> it would be checked if transaction latency over threshold (2 sec),
> if yes, printing related information for tracing.
> 
> /* Implement details */
> - Add tracepoint/trace at free transaction.
>   Since the original trace_binder_transaction_received cannot
>   precisely present the real finished time of transaction, adding a
>   trace_binder_free_transaction at the point of free transaction
>   may be more close to it.
> 
> - Add latency tracer module to monitor slow transaction.
>   The trace_binder_free_transaction would not be enabled
>   by default. Monitoring which transaction is too slow to
>   cause some of exceptions is important. So we hook the
>   tracepoint to call the monitor function.
> 
> - Move some struct from core file to header file.
>   Need some struct defined in core file in latency trace module
>   In addition, moving all structs to header file makes module
>   more extendable, and make all these strcuts to be defined
>   in the same file.
> 
> Signed-off-by: Frankie Chang <Frankie.Chang@...iatek.com>
> ---
>  drivers/android/Kconfig                 |    8 +
>  drivers/android/Makefile                |    1 +
>  drivers/android/binder.c                |  408 +-----------------------------
>  drivers/android/binder_internal.h       |  416 +++++++++++++++++++++++++++++++
>  drivers/android/binder_latency_tracer.c |  105 ++++++++
>  drivers/android/binder_trace.h          |   49 ++++
>  6 files changed, 583 insertions(+), 404 deletions(-)
>  create mode 100644 drivers/android/binder_latency_tracer.c

What changed from previous versions?  That always needs to go below the
--- line, as is documented in the kernel documentation.

Please fix that up and resend a v4.

thanks,

greg k-h