From: Leo Yan <leo.yan@linaro.org>
To: Denis Nikitin <denik@chromium.org>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>,
Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>,
linux-arm-msm@vger.kernel.org, coresight@lists.linaro.org,
linux-kernel@vger.kernel.org, Stephen Boyd <swboyd@chromium.org>,
linux-arm-kernel@lists.infradead.org,
Mike Leach <mike.leach@linaro.org>
Subject: Re: [PATCH] coresight: etm4x: Add config to exclude kernel mode tracing
Date: Fri, 16 Oct 2020 15:24:01 +0800 [thread overview]
Message-ID: <20201016072401.GC4646@leoy-ThinkPad-X240s> (raw)
In-Reply-To: <CADDJ8CXS8gGuXL45vR6xiHwJhZNcUJPvHMVYSGR6LDETRPJFiQ@mail.gmail.com>
On Thu, Oct 15, 2020 at 11:40:05PM -0700, Denis Nikitin wrote:
> Hi Mathieu,
>
> I think one of the use cases could be VMs.
> Is there isolation between EL1 guest kernels which we can control from perf
> in a system wide mode?
Sorry for suddenly jumping in.
For KVM, I think we need to implement mechanism for saving/restoring
CoreSight context for every guest OS, the CPU PMUs has implemented
related features [1].
Thanks,
Leo
[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm64/kvm/pmu.c
WARNING: multiple messages have this Message-ID (diff)
From: Leo Yan <leo.yan@linaro.org>
To: Denis Nikitin <denik@chromium.org>
Cc: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>,
Mathieu Poirier <mathieu.poirier@linaro.org>,
linux-arm-msm@vger.kernel.org, coresight@lists.linaro.org,
linux-kernel@vger.kernel.org, Stephen Boyd <swboyd@chromium.org>,
linux-arm-kernel@lists.infradead.org,
Mike Leach <mike.leach@linaro.org>
Subject: Re: [PATCH] coresight: etm4x: Add config to exclude kernel mode tracing
Date: Fri, 16 Oct 2020 15:24:01 +0800 [thread overview]
Message-ID: <20201016072401.GC4646@leoy-ThinkPad-X240s> (raw)
In-Reply-To: <CADDJ8CXS8gGuXL45vR6xiHwJhZNcUJPvHMVYSGR6LDETRPJFiQ@mail.gmail.com>
On Thu, Oct 15, 2020 at 11:40:05PM -0700, Denis Nikitin wrote:
> Hi Mathieu,
>
> I think one of the use cases could be VMs.
> Is there isolation between EL1 guest kernels which we can control from perf
> in a system wide mode?
Sorry for suddenly jumping in.
For KVM, I think we need to implement mechanism for saving/restoring
CoreSight context for every guest OS, the CPU PMUs has implemented
related features [1].
Thanks,
Leo
[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm64/kvm/pmu.c
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next prev parent reply other threads:[~2020-10-16 7:24 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-15 12:45 [PATCH] coresight: etm4x: Add config to exclude kernel mode tracing Sai Prakash Ranjan
2020-10-15 12:45 ` Sai Prakash Ranjan
2020-10-15 14:27 ` Suzuki K Poulose
2020-10-15 14:27 ` Suzuki K Poulose
2020-10-16 8:30 ` Sai Prakash Ranjan
2020-10-16 8:30 ` Sai Prakash Ranjan
2020-10-15 16:02 ` Mathieu Poirier
2020-10-15 16:02 ` Mathieu Poirier
[not found] ` <CADDJ8CXS8gGuXL45vR6xiHwJhZNcUJPvHMVYSGR6LDETRPJFiQ@mail.gmail.com>
2020-10-16 7:24 ` Leo Yan [this message]
2020-10-16 7:24 ` Leo Yan
2020-10-16 8:40 ` Sai Prakash Ranjan
2020-10-16 8:40 ` Sai Prakash Ranjan
2020-10-16 9:24 ` Leo Yan
2020-10-16 9:24 ` Leo Yan
2020-10-16 10:30 ` Sai Prakash Ranjan
2020-10-16 10:30 ` Sai Prakash Ranjan
2020-10-16 11:38 ` Suzuki Poulose
2020-10-16 11:38 ` Suzuki Poulose
2020-10-16 13:14 ` Leo Yan
2020-10-16 13:14 ` Leo Yan
2020-10-16 13:17 ` Suzuki Poulose
2020-10-16 13:17 ` Suzuki Poulose
2020-10-16 11:11 ` Suzuki Poulose
2020-10-16 11:11 ` Suzuki Poulose
2021-01-15 5:46 ` Sai Prakash Ranjan
2021-01-18 14:47 ` Mattias Nissler
2021-01-18 14:47 ` Mattias Nissler
2021-01-19 5:12 ` Sai Prakash Ranjan
2021-01-18 20:23 ` Mathieu Poirier
2021-01-18 20:23 ` Mathieu Poirier
2021-01-19 5:21 ` Sai Prakash Ranjan
2021-01-19 8:36 ` Al Grant
2021-01-19 8:36 ` Al Grant
2021-01-19 9:51 ` Sai Prakash Ranjan
2021-01-19 10:33 ` Suzuki K Poulose
2021-01-19 10:33 ` Suzuki K Poulose
2021-01-19 11:56 ` Al Grant
2021-01-19 11:56 ` Al Grant
2021-01-20 5:13 ` Sai Prakash Ranjan
2021-01-19 12:00 ` Sai Prakash Ranjan
2021-01-20 18:48 ` Mathieu Poirier
2021-01-20 18:48 ` Mathieu Poirier
2021-01-21 6:03 ` Sai Prakash Ranjan
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