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Wed, 05 Feb 2020 07:49:43 -0800 (PST) Date: Wed, 5 Feb 2020 10:49:43 -0500 From: Joel Fernandes To: Greg Kroah-Hartman Subject: Re: [PATCH v1 1/1] binder: transaction latency tracking for user build Message-ID: <20200205154943.GE142103@google.com> References: <1580885572-14272-1-git-send-email-Frankie.Chang@mediatek.com> <20200205093612.GA1167956@kroah.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200205093612.GA1167956@kroah.com> User-Agent: Mutt/1.10.1 (2018-07-13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200205_074945_465366_68660DCC X-CRM114-Status: GOOD ( 22.21 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Todd Kjos , wsd_upstream@mediatek.com, linux-kernel@vger.kernel.org, Arve =?iso-8859-1?B?SGr4bm5lduVn?= , Jian-Min.Liu@mediatek.com, linux-mediatek@lists.infradead.org, Frankie Chang , Martijn Coenen , Christian Brauner Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org On Wed, Feb 05, 2020 at 09:36:12AM +0000, Greg Kroah-Hartman wrote: > On Wed, Feb 05, 2020 at 02:52:52PM +0800, Frankie Chang wrote: > > Record start/end timestamp to 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. > > > > Signed-off-by: Frankie Chang > > --- > > drivers/android/Kconfig | 8 +++ > > drivers/android/binder.c | 107 +++++++++++++++++++++++++++++++++++++ > > drivers/android/binder_internal.h | 4 ++ > > 3 files changed, 119 insertions(+) > > > > diff --git a/drivers/android/Kconfig b/drivers/android/Kconfig > > index 6fdf2ab..7ba80eb 100644 > > --- a/drivers/android/Kconfig > > +++ b/drivers/android/Kconfig > > @@ -54,6 +54,14 @@ config ANDROID_BINDER_IPC_SELFTEST > > exhaustively with combinations of various buffer sizes and > > alignments. > > > > +config BINDER_USER_TRACKING > > + bool "Android Binder transaction tracking" > > + help > > + Used for track abnormal binder transaction which is over 2 seconds, > > + when the transaction is done or be free, this transaction would be > > + checked whether it executed overtime. > > + If yes, printing out the detail info about it. > > + > > endif # if ANDROID > > > > endmenu > > diff --git a/drivers/android/binder.c b/drivers/android/binder.c > > index e9bc9fc..5a352ee 100644 > > --- a/drivers/android/binder.c > > +++ b/drivers/android/binder.c > > @@ -76,6 +76,11 @@ > > #include "binder_internal.h" > > #include "binder_trace.h" > > > > +#ifdef CONFIG_BINDER_USER_TRACKING > > +#include > > +#include > > +#endif > > + > > static HLIST_HEAD(binder_deferred_list); > > static DEFINE_MUTEX(binder_deferred_lock); > > > > @@ -591,8 +596,104 @@ struct binder_transaction { > > * during thread teardown > > */ > > spinlock_t lock; > > +#ifdef CONFIG_BINDER_USER_TRACKING > > + struct timespec timestamp; > > + struct timeval tv; > > +#endif > > }; > > > > +#ifdef CONFIG_BINDER_USER_TRACKING > > + > > +/* > > + * binder_print_delay - Output info of a delay transaction > > + * @t: pointer to the over-time transaction > > + */ > > +static void binder_print_delay(struct binder_transaction *t) > > +{ > > + struct rtc_time tm; > > + struct timespec *startime; > > + struct timespec cur, sub_t; > > + > > + ktime_get_ts(&cur); > > + startime = &t->timestamp; > > + sub_t = timespec_sub(cur, *startime); > > + > > + /* if transaction time is over than 2 sec, > > + * show timeout warning log. > > + */ > > + if (sub_t.tv_sec < 2) > > + return; > > + > > + rtc_time_to_tm(t->tv.tv_sec, &tm); > > + > > + spin_lock(&t->lock); > > + pr_info_ratelimited("%d: from %d:%d to %d:%d", > > + t->debug_id, > > + t->from ? t->from->proc->pid : 0, > > + t->from ? t->from->pid : 0, > > + t->to_proc ? t->to_proc->pid : 0, > > + t->to_thread ? t->to_thread->pid : 0); > > + spin_unlock(&t->lock); > > + > > + pr_info_ratelimited(" total %u.%03ld s code %u start %lu.%03ld android %d-%02d-%02d %02d:%02d:%02d.%03lu\n", > > + (unsigned int)sub_t.tv_sec, > > + (sub_t.tv_nsec / NSEC_PER_MSEC), > > + t->code, > > + (unsigned long)startime->tv_sec, > > + (startime->tv_nsec / NSEC_PER_MSEC), > > + (tm.tm_year + 1900), (tm.tm_mon + 1), tm.tm_mday, > > + tm.tm_hour, tm.tm_min, tm.tm_sec, > > + (unsigned long)(t->tv.tv_usec / USEC_PER_MSEC)); > > +} > > Ick, why not use a tracepoint for this instead? > > And what is userspace supposed to do with this if they see it? Or another option is to implement this separately outside of binder.c using register_trace_* on the existing binder tracepoints, similar to what say the block tracer or preempt-off tracers do. Call it, say, "binder-latency tracer". That way all of this tracing code is in-kernel but outside of binder.c. thanks, - Joel _______________________________________________ Linux-mediatek mailing list Linux-mediatek@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-mediatek