From: Arnaldo Carvalho de Melo <arnaldo.melo@gmail.com>
To: Jiri Olsa <jolsa@redhat.com>
Cc: John Garry <john.garry@huawei.com>,
Arnaldo Carvalho de Melo <arnaldo.melo@gmail.com>,
peterz@infradead.org, mingo@redhat.com,
alexander.shishkin@linux.intel.com, namhyung@kernel.org,
mark.rutland@arm.com, will@kernel.org,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
Linuxarm <linuxarm@huawei.com>,
"linux-perf-users@vger.kernel.org"
<linux-perf-users@vger.kernel.org>
Subject: Re: perf top for arm64?
Date: Tue, 10 Dec 2019 16:48:25 -0300 [thread overview]
Message-ID: <20191210194825.GC13965@kernel.org> (raw)
In-Reply-To: <20191210163655.GG14123@krava>
Em Tue, Dec 10, 2019 at 05:36:55PM +0100, Jiri Olsa escreveu:
> On Tue, Dec 10, 2019 at 04:13:49PM +0000, John Garry wrote:
> > Hi all,
> >
> > I find to my surprise that "perf top" does not work for arm64:
> >
> > root@ubuntu:/home/john/linux# tools/perf/perf top
> > Couldn't read the cpuid for this machine: No such file or directory
>
> there was recent change that check on cpuid and quits:
> 608127f73779 perf top: Initialize perf_env->cpuid, needed by the per arch annotation init routine
>
> Arnaldo,
> maybe this should be just a warning/info, because it seems to be related
> to annotations only..?
Right, my bad, I'll look into making this just a debug message and then
check in the annotation code when this is really needed to show an
error/popup window :-\
- Arnaldo
> get_cpuid is defined only for s390/x86/powerpc, so I guess it won't work
> on the rest as well
>
> jirka
>
> >
> > That's v5.5-rc1 release.
> >
> > It seems that we are just missing an arm64 version of get_cpuid() - with the
> > patch below, I now get as hoped:
> >
> > PerfTop: 32857 irqs/sec kernel:85.0% exact: 0.0% lost: 0/0 drop: 0/0
> > [4000Hz cycles], (all, 64 CPUs)
> > -------------------------------------------------------------------------------
> >
> > 8.99% [kernel] [k] arm_smmu_cmdq_issue_cmdlist
> > 5.80% [kernel] [k] __softirqentry_text_start
> > 4.49% [kernel] [k] _raw_spin_unlock_irqrestore
> > 3.48% [kernel] [k] el0_svc_common.constprop.2
> > 3.37% [kernel] [k] _raw_write_lock_irqsave
> > 3.28% [kernel] [k] __local_bh_enable_ip
> > 3.05% [kernel] [k] __blk_complete_request
> > 2.07% [kernel] [k] queued_spin_lock_slowpath
> > 1.93% [vdso] [.] 0x0000000000000484
> >
> >
> > Was this just missed? Or is there a good reason to omit?
> >
> > Thanks,
> > John
> >
> > --->8---
> >
> > Subject: [PATCH] perf: Add perf top support for arm64
> >
> > Copied from get_cpuid_str() essentially...
> >
> > Signed-off-by: John Garry <john.garry@huawei.com>
> >
> > diff --git a/tools/perf/arch/arm64/util/header.c
> > b/tools/perf/arch/arm64/util/header.c
> > index a32e4b72a98f..ecd1f86e29cc 100644
> > --- a/tools/perf/arch/arm64/util/header.c
> > +++ b/tools/perf/arch/arm64/util/header.c
> > @@ -1,10 +1,12 @@
> > #include <stdio.h>
> > #include <stdlib.h>
> > #include <perf/cpumap.h>
> > +#include <util/cpumap.h>
> > #include <internal/cpumap.h>
> > #include <api/fs/fs.h>
> > #include "debug.h"
> > #include "header.h"
> > +#include <errno.h>
> >
> > #define MIDR "/regs/identification/midr_el1"
> > #define MIDR_SIZE 19
> > @@ -12,6 +14,59 @@
> > #define MIDR_VARIANT_SHIFT 20
> > #define MIDR_VARIANT_MASK (0xf << MIDR_VARIANT_SHIFT)
> >
> > +int
> > +get_cpuid(char *buffer, size_t sz)
> > +{
> > + char *buf = NULL;
> > + char path[PATH_MAX];
> > + const char *sysfs = sysfs__mountpoint();
> > + int cpu;
> > + u64 midr = 0;
> > + FILE *file;
> > +
> > + if (!sysfs)
> > + return EINVAL;
> > +
> > + buf = malloc(MIDR_SIZE);
> > + if (!buf)
> > + return EINVAL;
> > +
> > + /* read midr from list of cpus mapped to this pmu */
> > + for (cpu = 0; cpu < cpu__max_present_cpu(); cpu++) {
> > + scnprintf(path, sz, "%s/devices/system/cpu/cpu%d"MIDR,
> > + sysfs, cpu);
> > +
> > + file = fopen(path, "r");
> > + if (!file) {
> > + pr_debug("fopen failed for file %s\n", path);
> > + continue;
> > + }
> > +
> > + if (!fgets(buf, MIDR_SIZE, file)) {
> > + fclose(file);
> > + continue;
> > + }
> > + fclose(file);
> > +
> > + /* Ignore/clear Variant[23:20] and
> > + * Revision[3:0] of MIDR
> > + */
> > + midr = strtoul(buf, NULL, 16);
> > + midr &= (~(MIDR_VARIANT_MASK | MIDR_REVISION_MASK));
> > + scnprintf(buffer, MIDR_SIZE, "0x%016lx", midr);
> > + /* got midr break loop */
> > + break;
> > + }
> > +
> > + if (!midr) {
> > + pr_err("failed to get cpuid string\n");
> > + free(buf);
> > + return EINVAL;
> > + }
> > + return 0;
> > +}
> > +
> >
--
- Arnaldo
next prev parent reply other threads:[~2019-12-10 19:48 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-06 13:00 [RFC PATCH] perf tools: Fix cross compile for ARM64 John Garry
2019-11-06 14:00 ` Arnaldo Carvalho de Melo
2019-12-10 16:13 ` perf top for arm64? John Garry
2019-12-10 16:36 ` Jiri Olsa
2019-12-10 16:52 ` John Garry
2019-12-10 17:08 ` Jiri Olsa
2019-12-10 17:17 ` John Garry
2019-12-10 19:51 ` Arnaldo Carvalho de Melo
2019-12-11 13:33 ` [PATCHES] Fix 'perf top' breakage on architectures not providing get_cpuid() " Arnaldo Carvalho de Melo
2019-12-11 14:46 ` Mark Rutland
2019-12-11 15:28 ` Arnaldo Carvalho de Melo
2019-12-11 14:50 ` John Garry
2019-12-11 14:54 ` Jiri Olsa
2019-12-11 1:48 ` Joakim Zhang
2019-12-11 2:36 ` Zenghui Yu
2019-12-10 19:48 ` Arnaldo Carvalho de Melo [this message]
2019-11-12 11:17 ` [tip: perf/core] perf tools: Fix cross compile for ARM64 tip-bot2 for John Garry
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20191210194825.GC13965@kernel.org \
--to=arnaldo.melo@gmail.com \
--cc=alexander.shishkin@linux.intel.com \
--cc=john.garry@huawei.com \
--cc=jolsa@redhat.com \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-perf-users@vger.kernel.org \
--cc=linuxarm@huawei.com \
--cc=mark.rutland@arm.com \
--cc=mingo@redhat.com \
--cc=namhyung@kernel.org \
--cc=peterz@infradead.org \
--cc=will@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).