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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-tiny_5.2.bb
+3 -3
View File
@@ -15,9 +15,9 @@ DEPENDS += "openssl-native util-linux-native"
KMETA = "kernel-meta"
KCONF_BSP_AUDIT_LEVEL = "2"
SRCREV_machine_qemuarm ?= "e31887832108a1dfac19601459a84a2fa38207f7"
SRCREV_machine ?= "25b14cdf9659c68ab32d66616dfdbbe2ece3fd94"
SRCREV_meta ?= "56f5bc749e5a8e40b55a3819288ac277813ec5ef"
SRCREV_machine_qemuarm ?= "aaa66d462ec17345dadd69b1ec0f3fcc83e82536"
SRCREV_machine ?= "255a750d28cd45df8923c3aba1e82c322757a50d"
SRCREV_meta ?= "b867b78b5019ae455af97dec7794cff7527d7624"
PV = "${LINUX_VERSION}+git${SRCPV}"