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| author | Jiri Kosina | 2019-03-05 15:56:28 +0100 |
|---|---|---|
| committer | Jiri Kosina | 2019-03-05 15:56:28 +0100 |
| commit | 7185a96981a2f8bb523dd87cad20a6b96c721ad5 (patch) | |
| tree | 887d82d0adb3c0f5d7b2dbebfcd2698524355353 /Documentation | |
| parent | Merge branch 'for-5.0/upstream-fixes' into for-linus (diff) | |
| parent | livepatch: Remove signal sysfs attribute (diff) | |
| download | kernel-qcow2-linux-7185a96981a2f8bb523dd87cad20a6b96c721ad5.tar.gz kernel-qcow2-linux-7185a96981a2f8bb523dd87cad20a6b96c721ad5.tar.xz kernel-qcow2-linux-7185a96981a2f8bb523dd87cad20a6b96c721ad5.zip | |
Merge branch 'for-5.1/fake-signal' into for-linus
Ability to send fake signal to blocking tasks automatically, instead of
requiring manual intervention, from Miroslav Benes
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-kernel-livepatch | 12 | ||||
| -rw-r--r-- | Documentation/livepatch/livepatch.txt | 15 |
2 files changed, 7 insertions, 20 deletions
diff --git a/Documentation/ABI/testing/sysfs-kernel-livepatch b/Documentation/ABI/testing/sysfs-kernel-livepatch index dac7e1e62a8b..85db352f68f9 100644 --- a/Documentation/ABI/testing/sysfs-kernel-livepatch +++ b/Documentation/ABI/testing/sysfs-kernel-livepatch @@ -33,18 +33,6 @@ Description: An attribute which indicates whether the patch is currently in transition. -What: /sys/kernel/livepatch/<patch>/signal -Date: Nov 2017 -KernelVersion: 4.15.0 -Contact: live-patching@vger.kernel.org -Description: - A writable attribute that allows administrator to affect the - course of an existing transition. Writing 1 sends a fake - signal to all remaining blocking tasks. The fake signal - means that no proper signal is delivered (there is no data in - signal pending structures). Tasks are interrupted or woken up, - and forced to change their patched state. - What: /sys/kernel/livepatch/<patch>/force Date: Nov 2017 KernelVersion: 4.15.0 diff --git a/Documentation/livepatch/livepatch.txt b/Documentation/livepatch/livepatch.txt index 71d7f286ec4d..4627b41ff02e 100644 --- a/Documentation/livepatch/livepatch.txt +++ b/Documentation/livepatch/livepatch.txt @@ -158,12 +158,11 @@ If a patch is in transition, this file shows 0 to indicate the task is unpatched and 1 to indicate it's patched. Otherwise, if no patch is in transition, it shows -1. Any tasks which are blocking the transition can be signaled with SIGSTOP and SIGCONT to force them to change their -patched state. This may be harmful to the system though. -/sys/kernel/livepatch/<patch>/signal attribute provides a better alternative. -Writing 1 to the attribute sends a fake signal to all remaining blocking -tasks. No proper signal is actually delivered (there is no data in signal -pending structures). Tasks are interrupted or woken up, and forced to change -their patched state. +patched state. This may be harmful to the system though. Sending a fake signal +to all remaining blocking tasks is a better alternative. No proper signal is +actually delivered (there is no data in signal pending structures). Tasks are +interrupted or woken up, and forced to change their patched state. The fake +signal is automatically sent every 15 seconds. Administrator can also affect a transition through /sys/kernel/livepatch/<patch>/force attribute. Writing 1 there clears @@ -411,8 +410,8 @@ Information about the registered patches can be found under /sys/kernel/livepatch. The patches could be enabled and disabled by writing there. -/sys/kernel/livepatch/<patch>/signal and /sys/kernel/livepatch/<patch>/force -attributes allow administrator to affect a patching operation. +/sys/kernel/livepatch/<patch>/force attributes allow administrator to affect a +patching operation. See Documentation/ABI/testing/sysfs-kernel-livepatch for more details. |