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Date: Mon, 05 May 2014 12:27:59 +0200
From: Christian Borntraeger <borntraeger@...ibm.com>
To: David Ahern <dsahern@...il.com>
CC: Paolo Bonzini <pbonzini@...hat.com>, Jiri Olsa <jolsa@...hat.com>,
KVM <kvm@...r.kernel.org>,
linux-s390 <linux-s390@...r.kernel.org>,
Cornelia Huck <cornelia.huck@...ibm.com>,
Arnaldo Carvalho de Melo <acme@...hat.com>,
linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
Alexander Yarygin <yarygin@...ux.vnet.ibm.com>
Subject: Re: [PATCH 08/11] perf kvm: allow for variable string sizes
David,
thanks for the review.
Are you ok with this change as well? The alternative is to shorten our descriptions (in 1/11 s390: add sie exit reasons tables), which would make the trace output less comprehensible, though.
Christian
On 25/04/14 11:12, Christian Borntraeger wrote:
> From: Alexander Yarygin <yarygin@...ux.vnet.ibm.com>
>
> This makes it possible for other architectures to decode to different
> string lengths.
>
> Needed by follow-up patch "perf kvm: add stat support on s390".
>
> Signed-off-by: Alexander Yarygin <yarygin@...ux.vnet.ibm.com>
> Signed-off-by: Christian Borntraeger <borntraeger@...ibm.com>
> ---
> tools/perf/builtin-kvm.c | 38 +++++++++++++++++++++++---------------
> 1 file changed, 23 insertions(+), 15 deletions(-)
>
> diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c
> index 922706c..806c0e4 100644
> --- a/tools/perf/builtin-kvm.c
> +++ b/tools/perf/builtin-kvm.c
> @@ -75,7 +75,7 @@ struct kvm_events_ops {
> bool (*is_end_event)(struct perf_evsel *evsel,
> struct perf_sample *sample, struct event_key *key);
> void (*decode_key)(struct perf_kvm_stat *kvm, struct event_key *key,
> - char decode[20]);
> + char *decode);
> const char *name;
> };
>
> @@ -84,6 +84,8 @@ struct exit_reasons_table {
> const char *reason;
> };
>
> +#define DECODE_STR_LEN_MAX 80
> +
> #define EVENTS_BITS 12
> #define EVENTS_CACHE_SIZE (1UL << EVENTS_BITS)
>
> @@ -101,6 +103,8 @@ struct perf_kvm_stat {
> struct exit_reasons_table *exit_reasons;
> const char *exit_reasons_isa;
>
> + int decode_str_len;
> +
> struct kvm_events_ops *events_ops;
> key_cmp_fun compare;
> struct list_head kvm_events_cache[EVENTS_CACHE_SIZE];
> @@ -182,12 +186,12 @@ static const char *get_exit_reason(struct perf_kvm_stat *kvm,
>
> static void exit_event_decode_key(struct perf_kvm_stat *kvm,
> struct event_key *key,
> - char decode[20])
> + char *decode)
> {
> const char *exit_reason = get_exit_reason(kvm, kvm->exit_reasons,
> key->key);
>
> - scnprintf(decode, 20, "%s", exit_reason);
> + scnprintf(decode, kvm->decode_str_len, "%s", exit_reason);
> }
>
> static struct kvm_events_ops exit_events = {
> @@ -249,10 +253,11 @@ static bool mmio_event_end(struct perf_evsel *evsel, struct perf_sample *sample,
>
> static void mmio_event_decode_key(struct perf_kvm_stat *kvm __maybe_unused,
> struct event_key *key,
> - char decode[20])
> + char *decode)
> {
> - scnprintf(decode, 20, "%#lx:%s", (unsigned long)key->key,
> - key->info == KVM_TRACE_MMIO_WRITE ? "W" : "R");
> + scnprintf(decode, kvm->decode_str_len, "%#lx:%s",
> + (unsigned long)key->key,
> + key->info == KVM_TRACE_MMIO_WRITE ? "W" : "R");
> }
>
> static struct kvm_events_ops mmio_events = {
> @@ -292,10 +297,11 @@ static bool ioport_event_end(struct perf_evsel *evsel,
>
> static void ioport_event_decode_key(struct perf_kvm_stat *kvm __maybe_unused,
> struct event_key *key,
> - char decode[20])
> + char *decode)
> {
> - scnprintf(decode, 20, "%#llx:%s", (unsigned long long)key->key,
> - key->info ? "POUT" : "PIN");
> + scnprintf(decode, kvm->decode_str_len, "%#llx:%s",
> + (unsigned long long)key->key,
> + key->info ? "POUT" : "PIN");
> }
>
> static struct kvm_events_ops ioport_events = {
> @@ -523,13 +529,13 @@ static bool handle_end_event(struct perf_kvm_stat *kvm,
> time_diff = sample->time - time_begin;
>
> if (kvm->duration && time_diff > kvm->duration) {
> - char decode[32];
> + char decode[DECODE_STR_LEN_MAX];
>
> kvm->events_ops->decode_key(kvm, &event->key, decode);
> if (strcmp(decode, "HLT")) {
> - pr_info("%" PRIu64 " VM %d, vcpu %d: %s event took %" PRIu64 "usec\n",
> + pr_info("%" PRIu64 " VM %d, vcpu %d: %*s event took %" PRIu64 "usec\n",
> sample->time, sample->pid, vcpu_record->vcpu_id,
> - decode, time_diff/1000);
> + 32, decode, time_diff/1000);
> }
> }
>
> @@ -738,7 +744,7 @@ static void show_timeofday(void)
>
> static void print_result(struct perf_kvm_stat *kvm)
> {
> - char decode[20];
> + char decode[DECODE_STR_LEN_MAX];
> struct kvm_event *event;
> int vcpu = kvm->trace_vcpu;
>
> @@ -749,7 +755,7 @@ static void print_result(struct perf_kvm_stat *kvm)
>
> pr_info("\n\n");
> print_vcpu_info(kvm);
> - pr_info("%20s ", kvm->events_ops->name);
> + pr_info("%*s ", kvm->decode_str_len, kvm->events_ops->name);
> pr_info("%10s ", "Samples");
> pr_info("%9s ", "Samples%");
>
> @@ -768,7 +774,7 @@ static void print_result(struct perf_kvm_stat *kvm)
> min = get_event_min(event, vcpu);
>
> kvm->events_ops->decode_key(kvm, &event->key, decode);
> - pr_info("%20s ", decode);
> + pr_info("%*s ", kvm->decode_str_len, decode);
> pr_info("%10llu ", (unsigned long long)ecount);
> pr_info("%8.2f%% ", (double)ecount / kvm->total_count * 100);
> pr_info("%8.2f%% ", (double)etime / kvm->total_time * 100);
> @@ -839,9 +845,11 @@ static int cpu_isa_init(struct perf_kvm_stat *kvm, const char *cpuid)
> if (strstr(cpuid, "Intel")) {
> kvm->exit_reasons = vmx_exit_reasons;
> kvm->exit_reasons_isa = "VMX";
> + kvm->decode_str_len = 20;
> } else if (strstr(cpuid, "AMD")) {
> kvm->exit_reasons = svm_exit_reasons;
> kvm->exit_reasons_isa = "SVM";
> + kvm->decode_str_len = 20;
> } else {
> pr_err("CPU %s is not supported.\n", cpuid);
> return -ENOTSUP;
>
--
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