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From: Frankie Chang To: Todd Kjos CC: Greg Kroah-Hartman , Joel Fernandes , Martijn Coenen , Arve =?ISO-8859-1?Q?Hj=F8nnev=E5g?= , Christian Brauner , LKML , , wsd_upstream , Jian-Min Liu Date: Mon, 3 Aug 2020 11:11:16 +0800 In-Reply-To: References: <1595252430.5899.6.camel@mtkswgap22> <1595906401-11985-1-git-send-email-Frankie.Chang@mediatek.com> <1595906401-11985-3-git-send-email-Frankie.Chang@mediatek.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.2.3-0ubuntu6 MIME-Version: 1.0 X-TM-SNTS-SMTP: 538817EDDCF731873A891B6A7D5A4FC560716D01388453026712EC4D613164242000:8 X-MTK: N Content-Transfer-Encoding: base64 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org T24gRnJpLCAyMDIwLTA3LTMxIGF0IDExOjUwIC0wNzAwLCBUb2RkIEtqb3Mgd3JvdGU6DQo+IE9u IE1vbiwgSnVsIDI3LCAyMDIwIGF0IDg6MjggUE0gRnJhbmtpZSBDaGFuZw0KPiA8RnJhbmtpZS5D aGFuZ0BtZWRpYXRlay5jb20+IHdyb3RlOg0KPiA+DQo+ID4gRnJvbTogIkZyYW5raWUuQ2hhbmci 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<1596424276.5207.13.camel@mtkswgap22> Subject: Re: [PATCH v6 2/3] binder: add trace at free transaction. From: Frankie Chang To: Todd Kjos Date: Mon, 3 Aug 2020 11:11:16 +0800 In-Reply-To: References: <1595252430.5899.6.camel@mtkswgap22> <1595906401-11985-1-git-send-email-Frankie.Chang@mediatek.com> <1595906401-11985-3-git-send-email-Frankie.Chang@mediatek.com> X-Mailer: Evolution 3.2.3-0ubuntu6 MIME-Version: 1.0 X-TM-SNTS-SMTP: 538817EDDCF731873A891B6A7D5A4FC560716D01388453026712EC4D613164242000:8 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200802_231134_453987_E78C4C86 X-CRM114-Status: GOOD ( 22.78 ) 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: wsd_upstream , Greg Kroah-Hartman , LKML , Arve =?ISO-8859-1?Q?Hj=F8nnev=E5g?= , Jian-Min Liu , linux-mediatek@lists.infradead.org, Joel Fernandes , 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 Fri, 2020-07-31 at 11:50 -0700, Todd Kjos wrote: > On Mon, Jul 27, 2020 at 8:28 PM Frankie Chang > wrote: > > > > From: "Frankie.Chang" > > > > Since the original trace_binder_transaction_received cannot > > precisely present the real finished time of transaction, adding a > > trace_binder_txn_latency_free at the point of free transaction > > may be more close to it. > > > > Signed-off-by: Frankie.Chang > > --- > > drivers/android/binder.c | 6 ++++++ > > drivers/android/binder_trace.h | 27 +++++++++++++++++++++++++++ > > 2 files changed, 33 insertions(+) > > > > diff --git a/drivers/android/binder.c b/drivers/android/binder.c > > index 2df146f..1e6fc40 100644 > > --- a/drivers/android/binder.c > > +++ b/drivers/android/binder.c > > @@ -1522,6 +1522,9 @@ static void binder_free_transaction(struct binder_transaction *t) > > * If the transaction has no target_proc, then > > * t->buffer->transaction has already been cleared. > > */ > > + spin_lock(&t->lock); > > + trace_binder_txn_latency_free(t); > > + spin_unlock(&t->lock); > > Hmm. I don't prefer taking the lock just to call a trace. It doesn't > make clear why the lock has to be taken. I'd prefer something like: > > if (trace_binder_txn_latency_free_enabled()) { c > } > > And then the trace would use the passed-in values instead of accessing > via t->to_proc/to_thread. > Then we still add lock protection in the hook function, when trace is disable ? Or we also pass these to hook function, no matter the trace is enable or not.I think this way is more clear that the lock protects @from, @to_proc and @to_thread.Then, there is no need to add the lock in hook function. int from_proc, from_thread, to_proc, to_thread; spin_lock(&t->lock); from_proc = t->from ? t->from->proc->pid : 0; from_thread = t->from ? t->from->pid :0; to_proc = t->to_proc ? t->to_proc->pid : 0; to_thread = t->to_thread ? t->to_thread->pid : 0; spin_unlock(&t->lock); trace_binder_txn_latency_free(t, from_proc, from_thread, to_proc, to_pid); > > binder_free_txn_fixups(t); > > kfree(t); > > binder_stats_deleted(BINDER_STAT_TRANSACTION); > > @@ -3093,6 +3096,9 @@ static void binder_transaction(struct binder_proc *proc, > > kfree(tcomplete); > > binder_stats_deleted(BINDER_STAT_TRANSACTION_COMPLETE); > > err_alloc_tcomplete_failed: > > + spin_lock(&t->lock); > > + trace_binder_txn_latency_free(t); > > + spin_unlock(&t->lock); > > kfree(t); > > binder_stats_deleted(BINDER_STAT_TRANSACTION); > > err_alloc_t_failed: > > diff --git a/drivers/android/binder_trace.h b/drivers/android/binder_trace.h > > index 6731c3c..8ac87d1 100644 > > --- a/drivers/android/binder_trace.h > > +++ b/drivers/android/binder_trace.h > > @@ -95,6 +95,33 @@ > > __entry->thread_todo) > > ); > > > > +TRACE_EVENT(binder_txn_latency_free, > > + TP_PROTO(struct binder_transaction *t), > > + TP_ARGS(t), > > + TP_STRUCT__entry( > > + __field(int, debug_id) > > + __field(int, from_proc) > > + __field(int, from_thread) > > + __field(int, to_proc) > > + __field(int, to_thread) > > + __field(unsigned int, code) > > + __field(unsigned int, flags) > > + ), > > + TP_fast_assign( > > + __entry->debug_id = t->debug_id; > > + __entry->from_proc = t->from ? t->from->proc->pid : 0; > > + __entry->from_thread = t->from ? t->from->pid : 0; > > + __entry->to_proc = t->to_proc ? t->to_proc->pid : 0; > > + __entry->to_thread = t->to_thread ? t->to_thread->pid : 0; > > + __entry->code = t->code; > > + __entry->flags = t->flags; > > + ), > > + TP_printk("transaction=%d from %d:%d to %d:%d flags=0x%x code=0x%x", > > + __entry->debug_id, __entry->from_proc, __entry->from_thread, > > + __entry->to_proc, __entry->to_thread, __entry->code, > > + __entry->flags) > > +); > > + > > TRACE_EVENT(binder_transaction, > > TP_PROTO(bool reply, struct binder_transaction *t, > > struct binder_node *target_node), > > -- > > 1.7.9.5 _______________________________________________ Linux-mediatek mailing list Linux-mediatek@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-mediatek