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linux-yocto/5.2: fix strace/ptrace long runtime issues

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Bumping SRCREVs to pickup the following kernel commit:

[
    Author: Bruce Ashfield <bruce.ashfield@gmail.com>
    Date:   Tue Oct 8 13:15:46 2019 +0000

        signal/ptrace: fix cgroup2/freezer long runtimes

        As reported in the thread: https://lkml.org/lkml/2019/10/1/789, in
        kernels with commit 76f969e8948d82 [cgroup: cgroup v2 freezer], we
        were seeing much longer runtime in strace/ptrace tests (4 minutes
        versus 4 seconds).

        The issue only manifests if CONFIG_PREEMPT is enabled, which is in
        all of the default configurations.

        As sugggested in the thread, the movement of preempt_enable_no_resched()
        until after the cgroup is frozen returns the behaviour to pre-5.2
        runtimes.

        Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
]

With this change in place, our times are back to normal:

   root@qemux86-64:~# cd /usr/lib/strace/ptest/tests
   root@qemux86-64:/usr/lib/strace/ptest/tests# time ../strace -o log -qq -esignal=none -e/clock ./printpath-umovestr>ttt

   real    0m3.909s
   user    0m0.534s
   sys     0m3.342s

This will eventually loop around via -stable, or may need future
tweaks, but it does address the immediate issue/symptom that we are
seeing, with no obvious side effects.

[YOCTO #13556]

(From OE-Core rev: 55a54aed27ffa94a235da526a39aeea59caa3417)

Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Bruce Ashfield
2019-10-08 10:26:29 -04:00
committed by Richard Purdie
parent 48cdc47f33
commit cdb9ea2a8b
3 changed files with 15 additions and 15 deletions
Download Patch File Download Diff File Expand all files Collapse all files
meta/recipes-kernel/linux/linux-yocto-rt_5.2.bb
+2 -2
View File
@@ -11,8 +11,8 @@ python () {
raise bb.parse.SkipRecipe("Set PREFERRED_PROVIDER_virtual/kernel to linux-yocto-rt to enable it")
}
SRCREV_machine ?= "90a5890111ca601af1cfba50939d4003fa8d9ce8"
SRCREV_meta ?= "56f5bc749e5a8e40b55a3819288ac277813ec5ef"
SRCREV_machine ?= "0a9f6ee2443b54c614107728ca76485916010023"
SRCREV_meta ?= "b867b78b5019ae455af97dec7794cff7527d7624"
SRC_URI = "git://git.yoctoproject.org/linux-yocto.git;branch=${KBRANCH};name=machine \
git://git.yoctoproject.org/yocto-kernel-cache;type=kmeta;name=meta;branch=yocto-5.2;destsuffix=${KMETA}"