FILE * wants cleanup_fclose().
Spotted by udev hwdb segfaulting in gnome-continuous' buildroot
construction.
Signed-off-by: Anthony G. Basile <blueness@gentoo.org>
The term "priority" is misleading because higher levels have lower
priority. "Level" is clearer and shorter.
This commit touches only the textual descriptions, not function and variable
names themselves. "Priority" is used in various command-line switches and
protocol constants, so completly getting rid of "priority" is hard.
I also left "priority" in various places where the clarity suffered
when it was removed.
Signed-off-by: Anthony G. Basile <blueness@gentoo.org>
We reintroduce hashmap.{h,c}, list.h and set.h verbatim from upstream,
before we punt dead code. The following is the upstream message:
This is a rewrite of the hashmap implementation. Its advantage is lower
memory usage.
It uses open addressing (entries are stored in an array, as opposed to
linked lists). Hash collisions are resolved with linear probing and
Robin Hood displacement policy. See the references in hashmap.c.
Some fun empirical findings about hashmap usage in systemd on my laptop:
- 98 % of allocated hashmaps are Sets.
- Sets contain 78 % of all entries, plain Hashmaps 17 %, and
OrderedHashmaps 5 %.
- 60 % of allocated hashmaps contain only 1 entry.
- 90 % of allocated hashmaps contain 5 or fewer entries.
- 75 % of all entries are in hashmaps that use trivial_hash_ops.
Clearly it makes sense to:
- store entries in distinct entry types. Especially for Sets - their
entries are the most numerous and they require the least information
to store an entry.
- have a way to store small numbers of entries directly in the hashmap
structs, and only allocate the usual entry arrays when the direct
storage is full.
The implementation has an optional debugging feature (enabled by
defining the ENABLE_HASHMAP_DEBUG macro), where it:
- tracks all allocated hashmaps in a linked list so that one can
easily find them in gdb,
- tracks which function/line allocated a given hashmap, and
- checks for invalid mixing of hashmap iteration and modification.
Since entries are not allocated one-by-one anymore, mempools are not
used for entries. Originally I meant to drop mempools entirely, but it's
still worth it to use them for the hashmap structs. My testing indicates
that it makes loading of units about 5 % faster (a test with 10000 units
where more than 200000 hashmaps are allocated - pure malloc: 449±4 ms,
mempools: 427±7 ms).
Here are some memory usage numbers, taken on my laptop with a more or
less normal Fedora setup after booting with SELinux disabled (SELinux
increases systemd's memory usage significantly):
systemd (PID 1) Original New Change
dirty memory (from pmap -x 1) [KiB] 2152 1264 -41 %
total heap allocations (from gdb-heap) [KiB] 1623 756 -53 %
Signed-off-by: Anthony G. Basile <blueness@gentoo.org>
Add mempool_alloc0_tile(). It's like mempool_alloc_tile(), but it
initializes the allocated tile's memory to zero.
Signed-off-by: Anthony G. Basile <blueness@gentoo.org>
On the Dell Inspiron 1520 both the atkbd and acpi-video input devices report
an event for pressing the brightness up / down key-combos, resulting in user
space seeing double events and increasing / decreasing the brightness 2 steps
for each keypress.
This hwdb snippet suppresses the atkbd events, making the Inspiron 1520 work
like most modern laptops which emit brightness up / down events through
acpi-video only.
Reported by Pavel Malyshev <p.malishev@gmail.com>
https://bugzilla.redhat.com/show_bug.cgi?id=1141525
Signed-off-by: Anthony G. Basile <blueness@gentoo.org>
We skip upstream commit
33488f19793dc0a86fdee27266c5319b5b78d695
because it breaks from our standard for where we put the hwdb.bin.
We may have to revisit this issue in the future.
Signed-off-by: Anthony G. Basile <blueness@gentoo.org>
Normally we shouldn#t log from "library" functions, but SELinux is
weird, hence upgrade security messages uniformly to LOG_ERR when in
enforcing mode.
Signed-off-by: Anthony G. Basile <blueness@gentoo.org>
APIs that query and return something cannot silently fail, they must
either return something useful, or an error. Fix that.
Also, properly rollback socket unit fd creation when something goes
wrong with the security framework.
Signed-off-by: Anthony G. Basile <blueness@gentoo.org>
previously mac_smack_apply(path, NULL) would operate on the symlink
itself while mac_smack_apply(path, "foo") would follow the symlink.
Let's clean this up an always operate on the symlink, which appears to
be the safer option.
Signed-off-by: Anthony G. Basile <blueness@gentoo.org>
a) always return negative errno error codes
b) always become a noop if smack is off
c) always take a NULL label as a request to remove it
Signed-off-by: Anthony G. Basile <blueness@gentoo.org>
With the current hashmap implementation that uses chaining, placing a
reservation can serve two purposes:
- To optimize putting of entries if the number of entries to put is
known. The reservation allocates buckets, so later resizing can be
avoided.
- To avoid having very long bucket chains after using
hashmap_move(_one).
In an alternative hashmap implementation it will serve an additional
purpose:
- To guarantee a subsequent hashmap_move(_one) will not fail with
-ENOMEM (this never happens in the current implementation).
Signed-off-by: Anthony G. Basile <blueness@gentoo.org>
