linux-kernel - [PATCHv3 4/4] cpupower: ToDo: Update ToDo with ideas for per_cpu

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Message-ID: <8994b7701058a590cfe718efe408a10d6c3e8217.1572972259.git.Janakarajan.Natarajan@amd.com>
Date:   Tue, 5 Nov 2019 17:16:57 +0000
From:   "Natarajan, Janakarajan" <Janakarajan.Natarajan@....com>
To:     "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Thomas Renninger <trenn@...e.com>, Shuah Khan <shuah@...nel.org>,
        Pu Wen <puwen@...on.com>, Borislav Petkov <bp@...e.de>,
        Allison Randal <allison@...utok.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Richard Fontana <rfontana@...hat.com>,
        "Natarajan, Janakarajan" <Janakarajan.Natarajan@....com>
Subject: [PATCHv3 4/4] cpupower: ToDo: Update ToDo with ideas for
 per_cpu_schedule handling

From: Janakarajan Natarajan <Janakarajan.Natarajan@....com>

Based on Thomas Renninger's feedback/ideas. Re-structure the code
to better handle the per_cpu_schedule mechanism which was introduced
when adding support for AMD Zen based processors.

Signed-off-by: Janakarajan Natarajan <Janakarajan.Natarajan@....com>
---
 tools/power/cpupower/ToDo | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/tools/power/cpupower/ToDo b/tools/power/cpupower/ToDo
index 6e8b89f282e6..b196a139a3e4 100644
--- a/tools/power/cpupower/ToDo
+++ b/tools/power/cpupower/ToDo
@@ -8,3 +8,17 @@ ToDos sorted by priority:
 - Add another c1e debug idle monitor
   -> Is by design racy with BIOS, but could be added
      with a --force option and some "be careful" messages
+- Add cpu_start()/cpu_stop() callbacks for monitor
+  -> This is to move the per_cpu logic from inside the
+     monitor to outside it. This can be given higher
+     priority in fork_it.
+- Fork as many processes as there are CPUs in case the
+  per_cpu_schedule flag is set.
+  -> Bind forked process to each cpu.
+  -> Execute start measures via the forked processes on
+     each cpu.
+  -> Run test executable in a forked process.
+  -> Execute stop measures via the forked processes on
+     each cpu.
+  This would be ideal as it will not introduce noise in the
+  tested executable.
-- 
2.17.1