From: Leo Yan <leo.yan@linaro.org>
To: Arnaldo Carvalho de Melo <acme@kernel.org>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Jiri Olsa <jolsa@redhat.com>, Namhyung Kim <namhyung@kernel.org>,
Mathieu Poirier <mathieu.poirier@linaro.org>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
Yonghong Song <yhs@fb.com>,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, netdev@vger.kernel.org,
bpf@vger.kernel.org
Cc: Peter Zijlstra <peterz@infradead.org>, coresight@lists.linaro.org
Subject: Re: [PATCH v2] perf cs-etm: Improve completeness for kernel address space
Date: Thu, 20 Jun 2019 11:51:46 +0800 [thread overview]
Message-ID: <20190620035146.GJ24549@leoy-ThinkPad-X240s> (raw)
In-Reply-To: <20190620005428.20883-1-leo.yan@linaro.org>
Hi all,
On Thu, Jun 20, 2019 at 08:54:28AM +0800, Leo Yan wrote:
[...]
> diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
> index 51dd00f65709..cf5906d667aa 100644
> --- a/tools/perf/Makefile.config
> +++ b/tools/perf/Makefile.config
> @@ -418,6 +418,26 @@ ifdef CORESIGHT
> endif
> LDFLAGS += $(LIBOPENCSD_LDFLAGS)
> EXTLIBS += $(OPENCSDLIBS)
> + ARM_PRE_START_SIZE := 0
> + ifeq ($(SRCARCH),arm64)
> + # Extract info from lds:
> + # . = ((((((((0xffffffffffffffff)) - (((1)) << (48)) + 1) + (0)) + (0x08000000))) + (0x08000000))) + 0x00080000;
> + # ARM_PRE_START_SIZE := (0x08000000 + 0x08000000 + 0x00080000)
> + ARM_PRE_START_SIZE := $(shell egrep ' \. \= \({8}0x[0-9a-fA-F]+\){2}' \
> + $(srctree)/arch/arm64/kernel/vmlinux.lds | \
> + sed -e 's/[(|)|.|=|+|<|;|-]//g' -e 's/ \+/ /g' -e 's/^[ \t]*//' | \
> + awk -F' ' '{print "("$$6 "+" $$7 "+" $$8")"}' 2>/dev/null)
> + endif
> + ifeq ($(SRCARCH),arm)
> + # Extract info from lds:
> + # . = ((0xC0000000)) + 0x00208000;
> + # ARM_PRE_START_SIZE := 0x00208000
> + ARM_PRE_START_SIZE := $(shell egrep ' \. \= \({2}0x[0-9a-fA-F]+\){2}' \
> + $(srctree)/arch/arm/kernel/vmlinux.lds | \
> + sed -e 's/[(|)|.|=|+|<|;|-]//g' -e 's/ \+/ /g' -e 's/^[ \t]*//' | \
> + awk -F' ' '{print "("$$2")"}' 2>/dev/null)
> + endif
> + CFLAGS += -DARM_PRE_START_SIZE="$(ARM_PRE_START_SIZE)"
I did testing for building perf with this patch, this patch is fragile
and easily introduce the building warning:
<command-line>: error: "ARM_PRE_START_SIZE" redefined [-Werror]
<command-line>: note: this is the location of the previous definition
To dismiss this error, I need to change the macro define as below:
+ CFLAGS += -DARM_PRE_START_SIZE=$(ARM_PRE_START_SIZE)
So I sent patch v3 to address this issue and please directly reivew
patch v3. Sorry for spamming.
Thanks,
Leo Yan
> $(call detected,CONFIG_LIBOPENCSD)
> ifdef CSTRACE_RAW
> CFLAGS += -DCS_DEBUG_RAW
> diff --git a/tools/perf/util/cs-etm.c b/tools/perf/util/cs-etm.c
> index 0c7776b51045..5fa0be3a3904 100644
> --- a/tools/perf/util/cs-etm.c
> +++ b/tools/perf/util/cs-etm.c
> @@ -613,10 +613,27 @@ static void cs_etm__free(struct perf_session *session)
> static u8 cs_etm__cpu_mode(struct cs_etm_queue *etmq, u64 address)
> {
> struct machine *machine;
> + u64 fixup_kernel_start = 0;
>
> machine = etmq->etm->machine;
>
> - if (address >= etmq->etm->kernel_start) {
> + /*
> + * Since arm and arm64 specify some memory regions prior to
> + * 'kernel_start', kernel addresses can be less than 'kernel_start'.
> + *
> + * For arm architecture, the 16MB virtual memory space prior to
> + * 'kernel_start' is allocated to device modules, a PMD table if
> + * CONFIG_HIGHMEM is enabled and a PGD table.
> + *
> + * For arm64 architecture, the root PGD table, device module memory
> + * region and BPF jit region are prior to 'kernel_start'.
> + *
> + * To reflect the complete kernel address space, compensate these
> + * pre-defined regions for kernel start address.
> + */
> + fixup_kernel_start = etmq->etm->kernel_start - ARM_PRE_START_SIZE;
> +
> + if (address >= fixup_kernel_start) {
> if (machine__is_host(machine))
> return PERF_RECORD_MISC_KERNEL;
> else
> --
> 2.17.1
>
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
prev parent reply other threads:[~2019-06-20 3:52 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-20 0:54 [PATCH v2] perf cs-etm: Improve completeness for kernel address space Leo Yan
2019-06-20 3:51 ` Leo Yan [this message]
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=20190620035146.GJ24549@leoy-ThinkPad-X240s \
--to=leo.yan@linaro.org \
--cc=acme@kernel.org \
--cc=alexander.shishkin@linux.intel.com \
--cc=ast@kernel.org \
--cc=bpf@vger.kernel.org \
--cc=coresight@lists.linaro.org \
--cc=daniel@iogearbox.net \
--cc=jolsa@redhat.com \
--cc=kafai@fb.com \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mathieu.poirier@linaro.org \
--cc=namhyung@kernel.org \
--cc=netdev@vger.kernel.org \
--cc=peterz@infradead.org \
--cc=songliubraving@fb.com \
--cc=suzuki.poulose@arm.com \
--cc=yhs@fb.com \
/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).