Age | Commit message (Collapse) | Author |
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No need to check if links that still belong to us, need to be updated.
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If rules set NAME, SYMLINK, OWNER, GROUP, MODE, events without a device node
and remove events will skip the entire rule. The old parser did the same.
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is applied
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I'm worried about what will happen with things like
KERNELS=="*" # pointless rule
KERNELS=="doesnt-match" # another pointless rule
Since TK_RULE < TK_M_PARENTS_MAX, we will try to match all three tokens
against parents of the current device. I can't think of a bad case,
but it's not exactly good either.
Signed-off-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
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LAST_RULE was broken, and I broke TK_END by making it do the same.
It used a "break" which exited the switch statement, but not the loop!
==2953== Invalid read of size 4
==2953== at 0x4081EE: dump_token (udev-rules.c:859)
==2953== by 0x40BADB: udev_rules_apply_to_event (udev-rules.c:1849)
==2953== by 0x403F17: udev_event_execute_rules (udev-event.c:554)
==2953== by 0x418626: main (test-udev.c:100)
==2953== Address 0x55ab1f8 is 0 bytes after a block of size 80 alloc'd
==2953== at 0x4C23082: realloc (vg_replace_malloc.c:429)
==2953== by 0x40B13B: udev_rules_new (udev-rules.c:1670)
==2953== by 0x418536: main (test-udev.c:84)
...
Signed-off-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
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cur can't become NULL, and the check for TK_END
can be folded into the switch statement.
Signed-off-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
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s/ressources/resources/
Also reduce commas per sentence and add a possessive apostrophe.
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Thanks to Alan Jenkins, for the idea.
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Initializing a char array to "" is equivalent to a memset()
call - which is exactly what it gets compiled to.
Fixing this one callsite reduced memset() _user_ cpu cycles
from 2-4% to 0.05% on the EeePC.
Signed-off-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
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This crops up in my threaded udevd profiles from time to time.
It's not consistent - probably due to variations in the number
of concurrent events - but it can hit 4% user time and higher.
The change halves the user time spent in compare_devpath().
Signed-off-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
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This cuts down the large rule set's 120.000 calls to fnmatch() to
51.000, and we can just call strcmp for the simple matches.
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This cuts down the number of parsing /etc/group from ~700 to 11,
with some large rule files installed.
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The wait should be ordered after matching KERNEL, ENV, etc.
but before ATTR.
Without this, WAIT_FOR_SYSFS rules will be applied unconditionally
to all events.
Signed-off-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
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Re: b99028c96307e729303be8f6750418979a7488b9 shrink struct udev_event
TEST 136: test multi matches 2
device '/devices/pci0000:00/0000:00:1d.7/usb5/5-2/5-2:1.0/tty/ttyACM0' expecting node 'right'
==15011==
==15011== 7 bytes in 1 blocks are definitely lost in loss record 1 of 1
==15011== at 0x47F9AB8: malloc (vg_replace_malloc.c:207)
==15011== by 0x489CB5F: strdup (in /lib32/libc-2.7.so)
==15011== by 0x8050F40: udev_rules_apply_to_event (udev-rules.c:1973)
==15011== by 0x804A658: udev_event_execute_rules (udev-event.c:549)
==15011== by 0x805A636: main (test-udev.c:100)
add: ok
==15012==
==15012== 7 bytes in 1 blocks are definitely lost in loss record 1 of 1
==15012== at 0x47F1AB8: malloc (vg_replace_malloc.c:207)
==15012== by 0x4898B5F: strdup (in /lib32/libc-2.7.so)
==15012== by 0x8050F40: udev_rules_apply_to_event (udev-rules.c:1973)
==15012== by 0x804A9DF: udev_event_execute_rules (udev-event.c:658)
==15012== by 0x805A636: main (test-udev.c:100)
remove: ok
Signed-off-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
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The in-memory rule array of a common desktop distro install took:
1151088 bytes
with the token list:
109232 bytes tokens (6827 * 16 bytes), 71302 bytes buffer
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Signed-off-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
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The problem was strncpy() doesn't stop after writing the terminating
NUL; by definition it goes on to zero the entire buffer.
I spy another use of strncpy in udev_device_add_property_from_string(),
which is responsible for another ~1% user cpu time...
Signed-off-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
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Measured 2% _user_ cpu time reduction on EeePC coldplug.
Signed-off-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
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Since we already know the length, use memcpy() instead.
Measured 2% _user_ cpu time reduction on EeePC coldplug.
Signed-off-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
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Use calloc to request cleared memory instead.
Kernel and libc conspire to make this more efficient.
Also, replace one malloc() + strcpy() with strdup().
Signed-off-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
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