Use Persistent Memory as storage for disk cache

[cukiernik]

Allows use the Intel Optane Persistent Memory as a storage for cache. It map storage directly into user space memory, so reads and writes are doing by a memcpy (without calls an io).

For configure use script tools/ipm-configure. It be need restart system probably, and run again. It configure PMem into AppDirect mode, and configure nemespaces to devdax mode. Data stored in them, be able after restart.

[cukiernik]

#8693

[bryancall]

@SolidWallOfCode is going to review this

[bryancall]

@moonchen will review this

[cukiernik]

Can You help mi about RAT fail? It be ok, if I put Intel Open Source License into headers?

[bneradt]

Can You help mi about RAT fail? It be ok, if I put Intel Open Source License into headers?

It's just alerting that some of the new files do not have valid license headers:

• ./tools/ipm-configure
• ./tools/ipm-performance

You can just copy and paste the license from one of the other tools files into those files. For example:

trafficserver/tools/build_h3_tools.sh

Lines 6 to 20 in 1c038e5

	# Licensed to the Apache Software Foundation (ASF) under one
	# or more contributor license agreements. See the NOTICE file
	# distributed with this work for additional information
	# regarding copyright ownership. The ASF licenses this file
	# to you under the Apache License, Version 2.0 (the
	# "License"); you may not use this file except in compliance
	# with the License. You may obtain a copy of the License at
	#
	# http://www.apache.org/licenses/LICENSE-2.0
	#
	# Unless required by applicable law or agreed to in writing, software
	# distributed under the License is distributed on an "AS IS" BASIS,
	# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	# See the License for the specific language governing permissions and
	# limitations under the License.

---

Update

Oh, I see. This patch copies content from Intel. Hmmm...it looks like their copyright is a pretty open, BSD style license? I believe what we may want to do is copy both the Intel copyright and our Apache copyright into this file. @bryancall / @zwoop : do you know what the precedent is for such copies from other source code?

[moonchen]

This has been in draft for a while. Is it ready for review?

[bryancall]

[approve ci autest]

[ezelkow1]

[approve ci centos cmake]

[bryancall]

[approve ci]

[bryancall]

@cukiernik is this change relevant since Intel stopped supporting Optane?

[github-actions]

This pull request has been automatically marked as stale because it has not had recent activity. Marking it stale to flag it for further consideration by the community.