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From: kan.liang@linux.intel.com
To: acme@kernel.org, jolsa@redhat.com, peterz@infradead.org,
	mingo@redhat.com, linux-kernel@vger.kernel.org
Cc: namhyung@kernel.org, adrian.hunter@intel.com,
	mathieu.poirier@linaro.org, ravi.bangoria@linux.ibm.com,
	alexey.budankov@linux.intel.com, vitaly.slobodskoy@intel.com,
	pavel.gerasimov@intel.com, mpe@ellerman.id.au,
	eranian@google.com, ak@linux.intel.com,
	Kan Liang <kan.liang@linux.intel.com>
Subject: [PATCH V3 05/17] perf machine: Remove the indent in resolve_lbr_callchain_sample
Date: Fri, 13 Mar 2020 11:33:07 -0700	[thread overview]
Message-ID: <20200313183319.17739-6-kan.liang@linux.intel.com> (raw)
In-Reply-To: <20200313183319.17739-1-kan.liang@linux.intel.com>

From: Kan Liang <kan.liang@linux.intel.com>

The indent is unnecessary in resolve_lbr_callchain_sample.
Removing it will make the following patch simpler.

Current code path for resolve_lbr_callchain_sample()

        /* LBR only affects the user callchain */
        if (i != chain_nr) {
                body of the function
                ....
                return 1;
        }

        return 0;

With the patch,

        /* LBR only affects the user callchain */
        if (i == chain_nr)
                return 0;

        body of the function
        ...
        return 1;

No functional changes.

Reviewed-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
---
 tools/perf/util/machine.c | 123 +++++++++++++++++++-------------------
 1 file changed, 63 insertions(+), 60 deletions(-)

diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index fd14f1489802..9021e5b6a2a9 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -2177,6 +2177,12 @@ static int resolve_lbr_callchain_sample(struct thread *thread,
 	int chain_nr = min(max_stack, (int)chain->nr), i;
 	u8 cpumode = PERF_RECORD_MISC_USER;
 	u64 ip, branch_from = 0;
+	struct branch_stack *lbr_stack;
+	struct branch_entry *entries;
+	int lbr_nr, j, k;
+	bool branch;
+	struct branch_flags *flags;
+	int mix_chain_nr;
 
 	for (i = 0; i < chain_nr; i++) {
 		if (chain->ips[i] == PERF_CONTEXT_USER)
@@ -2184,71 +2190,68 @@ static int resolve_lbr_callchain_sample(struct thread *thread,
 	}
 
 	/* LBR only affects the user callchain */
-	if (i != chain_nr) {
-		struct branch_stack *lbr_stack = sample->branch_stack;
-		struct branch_entry *entries = perf_sample__branch_entries(sample);
-		int lbr_nr = lbr_stack->nr, j, k;
-		bool branch;
-		struct branch_flags *flags;
-		/*
-		 * LBR callstack can only get user call chain.
-		 * The mix_chain_nr is kernel call chain
-		 * number plus LBR user call chain number.
-		 * i is kernel call chain number,
-		 * 1 is PERF_CONTEXT_USER,
-		 * lbr_nr + 1 is the user call chain number.
-		 * For details, please refer to the comments
-		 * in callchain__printf
-		 */
-		int mix_chain_nr = i + 1 + lbr_nr + 1;
-
-		for (j = 0; j < mix_chain_nr; j++) {
-			int err;
-			branch = false;
-			flags = NULL;
+	if (i == chain_nr)
+		return 0;
 
-			if (callchain_param.order == ORDER_CALLEE) {
-				if (j < i + 1)
-					ip = chain->ips[j];
-				else if (j > i + 1) {
-					k = j - i - 2;
-					ip = entries[k].from;
-					branch = true;
-					flags = &entries[k].flags;
-				} else {
-					ip = entries[0].to;
-					branch = true;
-					flags = &entries[0].flags;
-					branch_from = entries[0].from;
-				}
+	lbr_stack = sample->branch_stack;
+	entries = perf_sample__branch_entries(sample);
+	lbr_nr = lbr_stack->nr;
+	/*
+	 * LBR callstack can only get user call chain.
+	 * The mix_chain_nr is kernel call chain
+	 * number plus LBR user call chain number.
+	 * i is kernel call chain number,
+	 * 1 is PERF_CONTEXT_USER,
+	 * lbr_nr + 1 is the user call chain number.
+	 * For details, please refer to the comments
+	 * in callchain__printf
+	 */
+	mix_chain_nr = i + 1 + lbr_nr + 1;
+
+	for (j = 0; j < mix_chain_nr; j++) {
+		int err;
+
+		branch = false;
+		flags = NULL;
+
+		if (callchain_param.order == ORDER_CALLEE) {
+			if (j < i + 1)
+				ip = chain->ips[j];
+			else if (j > i + 1) {
+				k = j - i - 2;
+				ip = entries[k].from;
+				branch = true;
+				flags = &entries[k].flags;
 			} else {
-				if (j < lbr_nr) {
-					k = lbr_nr - j - 1;
-					ip = entries[k].from;
-					branch = true;
-					flags = &entries[k].flags;
-				}
-				else if (j > lbr_nr)
-					ip = chain->ips[i + 1 - (j - lbr_nr)];
-				else {
-					ip = entries[0].to;
-					branch = true;
-					flags = &entries[0].flags;
-					branch_from = entries[0].from;
-				}
+				ip = entries[0].to;
+				branch = true;
+				flags = &entries[0].flags;
+				branch_from = entries[0].from;
+			}
+		} else {
+			if (j < lbr_nr) {
+				k = lbr_nr - j - 1;
+				ip = entries[k].from;
+				branch = true;
+				flags = &entries[k].flags;
+			} else if (j > lbr_nr)
+				ip = chain->ips[i + 1 - (j - lbr_nr)];
+			else {
+				ip = entries[0].to;
+				branch = true;
+				flags = &entries[0].flags;
+				branch_from = entries[0].from;
 			}
-
-			err = add_callchain_ip(thread, cursor, parent,
-					       root_al, &cpumode, ip,
-					       branch, flags, NULL,
-					       branch_from);
-			if (err)
-				return (err < 0) ? err : 0;
 		}
-		return 1;
-	}
 
-	return 0;
+		err = add_callchain_ip(thread, cursor, parent,
+				       root_al, &cpumode, ip,
+				       branch, flags, NULL,
+				       branch_from);
+		if (err)
+			return (err < 0) ? err : 0;
+	}
+	return 1;
 }
 
 static int find_prev_cpumode(struct ip_callchain *chain, struct thread *thread,
-- 
2.17.1


  parent reply	other threads:[~2020-03-13 18:34 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-13 18:33 [PATCH V3 00/17] Stitch LBR call stack (Perf Tools) kan.liang
2020-03-13 18:33 ` [PATCH V3 01/17] perf pmu: Add support for PMU capabilities kan.liang
2020-03-18 19:47   ` Arnaldo Carvalho de Melo
2020-03-19 13:07     ` Liang, Kan
2020-03-13 18:33 ` [PATCH V3 02/17] perf header: Support CPU " kan.liang
2020-03-18 19:49   ` Arnaldo Carvalho de Melo
2020-03-13 18:33 ` [PATCH V3 03/17] perf record: Clear HEADER_CPU_PMU_CAPS for non LBR call stack mode kan.liang
2020-03-13 18:33 ` [PATCH V3 04/17] perf stat: Clear HEADER_CPU_PMU_CAPS kan.liang
2020-03-13 18:33 ` kan.liang [this message]
2020-03-18 19:50   ` [PATCH V3 05/17] perf machine: Remove the indent in resolve_lbr_callchain_sample Arnaldo Carvalho de Melo
2020-03-13 18:33 ` [PATCH V3 06/17] perf machine: Refine the function for LBR call stack reconstruction kan.liang
2020-03-13 18:33 ` [PATCH V3 07/17] perf machine: Factor out lbr_callchain_add_kernel_ip() kan.liang
2020-03-13 18:33 ` [PATCH V3 08/17] perf machine: Factor out lbr_callchain_add_lbr_ip() kan.liang
2020-03-13 18:33 ` [PATCH V3 09/17] perf thread: Add a knob for LBR stitch approach kan.liang
2020-03-13 18:33 ` [PATCH V3 10/17] perf tools: Save previous sample for LBR stitching approach kan.liang
2020-03-18 12:14   ` Jiri Olsa
2020-03-18 14:20     ` Liang, Kan
2020-03-13 18:33 ` [PATCH V3 11/17] perf tools: Save previous cursor nodes " kan.liang
2020-03-13 18:33 ` [PATCH V3 12/17] perf tools: Stitch LBR call stack kan.liang
2020-03-13 18:33 ` [PATCH V3 13/17] perf report: Add option to enable the LBR stitching approach kan.liang
2020-03-13 18:33 ` [PATCH V3 14/17] perf script: " kan.liang
2020-03-13 18:33 ` [PATCH V3 15/17] perf top: " kan.liang
2020-03-18 12:14   ` Jiri Olsa
2020-03-18 14:19     ` Liang, Kan
2020-03-13 18:33 ` [PATCH V3 16/17] perf c2c: " kan.liang
2020-03-13 18:33 ` [PATCH V3 17/17] perf hist: Add fast path for duplicate entries check kan.liang

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