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authorJosh Poimboeuf <jpoimboe@redhat.com>2017-02-14 04:42:41 +0300
committerJiri Kosina <jkosina@suse.cz>2017-03-08 11:38:19 +0300
commit7c23b330011690705613a66a8239d2ca64a41d4d (patch)
tree272edb45a2674e0df61c4a27e72b7bffc110b8fd /Documentation/filesystems
parentd83a7cb375eec21f04c83542395d08b2f6641da2 (diff)
downloadlinux-7c23b330011690705613a66a8239d2ca64a41d4d.tar.xz
livepatch: add /proc/<pid>/patch_state
Expose the per-task patch state value so users can determine which tasks are holding up completion of a patching operation. Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> Reviewed-by: Petr Mladek <pmladek@suse.com> Reviewed-by: Miroslav Benes <mbenes@suse.cz> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'Documentation/filesystems')
-rw-r--r--Documentation/filesystems/proc.txt18
1 files changed, 18 insertions, 0 deletions
diff --git a/Documentation/filesystems/proc.txt b/Documentation/filesystems/proc.txt
index c94b4675d021..9036dbf16156 100644
--- a/Documentation/filesystems/proc.txt
+++ b/Documentation/filesystems/proc.txt
@@ -44,6 +44,7 @@ Table of Contents
3.8 /proc/<pid>/fdinfo/<fd> - Information about opened file
3.9 /proc/<pid>/map_files - Information about memory mapped files
3.10 /proc/<pid>/timerslack_ns - Task timerslack value
+ 3.11 /proc/<pid>/patch_state - Livepatch patch operation state
4 Configuring procfs
4.1 Mount options
@@ -1887,6 +1888,23 @@ Valid values are from 0 - ULLONG_MAX
An application setting the value must have PTRACE_MODE_ATTACH_FSCREDS level
permissions on the task specified to change its timerslack_ns value.
+3.11 /proc/<pid>/patch_state - Livepatch patch operation state
+-----------------------------------------------------------------
+When CONFIG_LIVEPATCH is enabled, this file displays the value of the
+patch state for the task.
+
+A value of '-1' indicates that no patch is in transition.
+
+A value of '0' indicates that a patch is in transition and the task is
+unpatched. If the patch is being enabled, then the task hasn't been
+patched yet. If the patch is being disabled, then the task has already
+been unpatched.
+
+A value of '1' indicates that a patch is in transition and the task is
+patched. If the patch is being enabled, then the task has already been
+patched. If the patch is being disabled, then the task hasn't been
+unpatched yet.
+
------------------------------------------------------------------------------
Configuring procfs