Change Vostro5581 to use its sku to match the rest, I suppouse it was
added before we had sku in dmi modalias.
Fix OCB4 sku instead a begining O letter needs to be a beggining zero,
checked in original bug report.
Reorder entries.
Use proper formatting.
For safety, prefer board product name, that always has the short name,
over system product name, that in few models has a very long string with
the short name at the end.
The following models added at the time of this commit BR1100FKA, RC72LA
and TP412UA needs a wildcard before when using pn.
Unmerged Q502LAB, Q551LB and Q551LN, in the merged match there are many
more unreported models.
Sort by the first model in every group.
Rework acer matches to use system vendor with board name.
Is the most reliable way to deal with Acer.
While doing it discover that matches SP111-32N and SP111-34N broke in
c0443b97b7 (hwdb: add trailing ":*" everywhere, 2020-10-15)
Sort by the first model of every group.
Let's say a user has two services with ManagedOOMMemoryPressure=kill,
perhaps a web server under system.slice and a batch job under
user.slice. Both exceed their pressure limits. On the previous timer
tick, oomd has already queued the web server's candidate for killing,
but the prekill hook has not yet responded, so the kill is still
pending.
In the code, monitor_memory_pressure_contexts_handler() iterates over
all pressure targets that have exceeded their limits. When it reaches
the web server target and calls oomd_cgroup_kill_mark(), which returns 0
because that cgroup is already queued. The code treats this the same as
a successful new kill: it resets the 15 second delay timer and returns
from the function, exiting the loop.
This loop is handled by SET_FOREACH and the iteration order is
hash-dependent. As such, if the web server target happens coincidentally
to be visited first, oomd never evaluates the batch job target at all.
The effect is twofold:
1. oomd stalls for 15 seconds despite not having initiated any new kill.
That can unnecessarily delay further action to stem increases in
memory pressure. The delay exists to let stale pressure counters
settle after a kill, but no kill has happened here.
2. It non-deterministically skips pressure targets that may have
unqueued candidates, dangerously allowing memory pressure to persist
for longer than it should.
Fix this by skipping cgroups that are already queued so the loop
proceeds to try other pressure targets. We should only delay when a new
kill mark is actually created.
Consider a workload slice with several sibling cgroups. Imagine that one
of those cgroups is removed between the moment oomd enumerates the
directory and the moment it reads memory.oom.group. This is actually
relatively plausible under the high memory pressure conditions where
oomd is most needed.
In this case, the failed read prompts us to `return 0`, which exits the
entire enumeration loop in recursively_get_cgroup_context(). As a
result, all remaining sibling cgroups are silently dropped from the
candidate list for that monitoring cycle.
The effect is that oomd can fail to identify and kill the actual
offending cgroup, allowing memory pressure to persist until a subsequent
cycle where the race doesn't occur.
Fix this by instead proceeding to evaluate further sibling cgroups.
Let's say a user has two services with ManagedOOMMemoryPressure=kill,
one for a web server under system.slice, and one for a batch job under
user.slice. The batch job is causing severe memory pressure, whereas the
web server's cgroup has no processes with significant pgscan activity.
In the code, monitor_memory_pressure_contexts_handler() iterates over
all pressure targets that have exceeded their limits. When
oomd_select_by_pgscan_rate() returns 0 (that is, no candidates) for a
target, we return from the entire SET_FOREACH loop instead of moving to
the next target. Since SET_FOREACH iteration order is hash-dependent, if
the web server target happens to be visited first, oomd will find no
kill candidates for it and exit the loop. The batch job target that is
actually slamming the machine will never even be evaluated, and can
continue to wreak havoc without any intervention.
The effect is that oomd non-deterministically and silently fails to kill
cgroups that it should actually kill, allowing memory pressure to
persist and dangerously build up on the machine.
The fix is simple, keep evaluating remaining targets when one does not
match.
These were introduced as part of the effort of sd-executor
worker pool (#29566), which never landed due to unsignificant
performance improvement. Let's just remove the unused
helpers. If that work ever gets resurrected they can be
restored from this commit pretty easily.
Emitting "oom" doesn't mesh with the org.freedesktop.oom1.Manager
Killed() API contract, which defines "memory-used" and "memory-pressure"
as possible reasons. Consumers that key off reason thus will either lose
policy attribution or may reject the unknown value completely.
Plumb the reason through so it is visible to consumers.
Emitting "oom" doesn't mesh with the org.freedesktop.oom1.Manager
Killed() API contract, which defines "memory-used" and "memory-pressure"
as possible reasons. Consumers that key off reason thus will either lose
policy attribution or may reject the unknown value completely.
Plumb the reason through so it is visible to consumers.
namespace_enter() now does a is_our_namespace() check, which requires
/proc on older kernels, which is not available anymore after we call
do_wipe_fully_visible_api_fs() in wipe_fully_visible_api_fs().
Let's just call setns() instead as namespace_enter() is overkill to
enter a single namespace anyway.
The default behavior is to sync repository metadata for every image
that does not have a cache and we recently changed behavior to
invalidate
all cached images whenever we decide the repository metadata needs to
be resynced.
In systemd we have two images that are not cached because they use
BaseTrees=
hence set CacheOnly=metadata to explicitly indicate these two images
should never cause a repository metadata if resync even though they are
not cached.
The default behavior is to sync repository metadata for every image
that does not have a cache and we recently changed behavior to invalidate
all cached images whenever we decide the repository metadata needs to
be resynced.
In systemd we have two images that are not cached because they use BaseTrees=
hence set CacheOnly=metadata to explicitly indicate these two images
should never cause a repository metadata if resync even though they are
not cached.
David Santamaría Rogado
Luca Boccassi
Zbigniew Jędrzejewski-Szmek
Yu Watanabe
Chris Down
Mike Yuan
Daan De Meyer
Ivan Kruglov
nikstur