wilderjds/kwin - kwin - gitea-jacopods

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Commit Graph

Author	SHA1	Message	Date
Vlad Zahorodnii	1fb9f6f13a	Switch to SPDX license markers The main advantage of SPDX license identifiers over the traditional license headers is that it's more difficult to overlook inappropriate licenses for kwin, for example GPL 3. We also don't have to copy a lot of boilerplate text. In order to create this change, I ran licensedigger -r -c from the toplevel source directory.	6 years ago
Martin Flöser	7c8003f7f6	Use real-time scheduling policy for kwin_wayland Summary: The base idea behind this change is to keep the system responsive no matter what other processes do. All input and rendering needs to go through the windowing system, so keeping it responsive is important. Currently KWin competes with all other processes for resources and this can render the system unusable. Consider some processes running amok. In this case the user might not be able to easily close the applications as KWin does not get the cpu time to perform the input tasks requested by the user. Or in the case of playing a demanding game it is important that KWin gets scheduled to forward the pointer input events. The user doesn't want that the game (or another process) wins against the windowing sytem. The disadvantage is that KWin always wins against other processes with real time scheduling. This could result in KWin running amok stalling the system. On the other hand this is no change to the current situation as if KWin runs amok the sytem is unusable. The change uses libcap to set CAP_SYS_NICE on kwin_wayland executable. KWin_wayland on start sets the scheduling policy to SCHED_RR with the lowest possible priority. Thus any other SCHED_RR process will win against KWin. So real time processes are not affected by this change! After adjusting the scheduling (which requires CAP_SYS_NICE) KWin drops this capability again. Test Plan: Verified that KWin adjusts the scheduler, that it is not passed to child processes, that the capability gets dropped and not passed to child processes. Reviewers: #kwin, #plasma Subscribers: plasma-devel, kwin Tags: #kwin Differential Revision: https://phabricator.kde.org/D7757	9 years ago
Martin Gräßlin	48ec13a881	Check for Xwayland as RUNTIME dependency Make distro's life easier by pointing out that kwin_wayland requires Xwayland.	10 years ago

Author

SHA1

Message

Date

Vlad Zahorodnii

1fb9f6f13a

Switch to SPDX license markers

The main advantage of SPDX license identifiers over the traditional
license headers is that it's more difficult to overlook inappropriate
licenses for kwin, for example GPL 3. We also don't have to copy a
lot of boilerplate text.

In order to create this change, I ran licensedigger -r -c from the
toplevel source directory.

6 years ago

Martin Flöser

7c8003f7f6

Use real-time scheduling policy for kwin_wayland

Summary:
The base idea behind this change is to keep the system responsive no
matter what other processes do. All input and rendering needs to go
through the windowing system, so keeping it responsive is important.

Currently KWin competes with all other processes for resources and this
can render the system unusable. Consider some processes running amok. In
this case the user might not be able to easily close the applications as
KWin does not get the cpu time to perform the input tasks requested by
the user.

Or in the case of playing a demanding game it is important that KWin
gets scheduled to forward the pointer input events. The user doesn't
want that the game (or another process) wins against the windowing
sytem.

The disadvantage is that KWin always wins against other processes with
real time scheduling. This could result in KWin running amok stalling
the system. On the other hand this is no change to the current situation
as if KWin runs amok the sytem is unusable.

The change uses libcap to set CAP_SYS_NICE on kwin_wayland executable.
KWin_wayland on start sets the scheduling policy to SCHED_RR with the
lowest possible priority. Thus any other SCHED_RR process will win
against KWin. So real time processes are not affected by this change!

After adjusting the scheduling (which requires CAP_SYS_NICE) KWin drops
this capability again.

Test Plan:
Verified that KWin adjusts the scheduler, that it is not passed
to child processes, that the capability gets dropped and not passed to
child processes.

Reviewers: #kwin, #plasma

Subscribers: plasma-devel, kwin

Tags: #kwin

Differential Revision: https://phabricator.kde.org/D7757

9 years ago

Martin Gräßlin

48ec13a881

Check for Xwayland as RUNTIME dependency

Make distro's life easier by pointing out that kwin_wayland requires
Xwayland.

10 years ago

2 Commits (4425bcd4e0b98a91c3500afe7204fec22b9032f6)