logind: change TasksMax= value for user logins to 33%

Let's change from a fixed value of 12288 tasks per user to a relative value of
33%, which with the kernel's default of 32768 translates to 10813. This is a
slight decrease of the limit, for no other reason than "33%" sounding like a nice
round number that is close enough to 12288 (which would translate to 37.5%).
(Well, it also has the nice effect of still leaving a bit of room in the PID
space if there are 3 cooperating evil users that try to consume all PIDs...
Also, I like my bikesheds blue).

Since the new value is taken relative, and machined's TasksMax= setting
defaults to 16384, 33% inside of containers is usually equivalent to 5406,
which should still be ample space.

To summarize:

               | on the host | in the container
   old default |       12288 |            12288
   new default |       10813 |             5406

1 files changed, 1 insertions, 1 deletions

diff --git a/src/login/logind.c b/src/login/logind.c
index d01dd110ea..5ce36d28c7 100644
--- a/src/login/logind.c
+++ b/src/login/logind.c
@@ -62,7 +62,7 @@ static void manager_reset_config(Manager *m) {
         m->idle_action = HANDLE_IGNORE;
 
         m->runtime_dir_size = physical_memory_scale(10U, 100U); /* 10% */
-        m->user_tasks_max = 12288;
+        m->user_tasks_max = system_tasks_max_scale(33U, 100U); /* 33% */
         m->sessions_max = 8192;
         m->inhibitors_max = 8192;