On Mon, Sep 27, 2021 at 10:55:53AM +0200, Mauro Carvalho Chehab wrote: > Em Thu, 23 Sep 2021 19:13:04 +0200 > Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> escreveu: > > > On Thu, Sep 23, 2021 at 05:41:11PM +0200, Mauro Carvalho Chehab wrote: > > > Hi Greg, > > > > > > As requested, this is exactly the same changes, rebased on the top of > > > driver-core/driver-core-next. > > > > > > - > > > > > > It follows a series of improvements for get_abi.pl. it is on the top of driver-core/driver-core-next. > > > > > > With such changes, on my development tree, the script is taking 6 seconds to run > > > on my desktop: > > > > > > $ !1076 > > > $ time ./scripts/get_abi.pl undefined |sort >undefined_after && cat undefined_after| perl -ne 'print "$1\n" if (m#.*/(\S+) not found#)'|sort|uniq -c|sort -nr >undefined_symbols; wc -l undefined_after undefined_symbols > > > > > > real 0m6,292s > > > user 0m5,640s > > > sys 0m0,634s > > > 6838 undefined_after > > > 808 undefined_symbols > > > 7646 total > > > > > > And 7 seconds on a Dell Precision 5820: > > > > > > $ time ./scripts/get_abi.pl undefined |sort >undefined && cat undefined| perl -ne 'print "$1\n" if (m#.*/(\S+) not found#)'|sort|uniq -c|sort -nr >undefined_symbols; wc -l undefined; wc -l undefined_symbols > > > > > > real 0m7.162s > > > user 0m5.836s > > > sys 0m1.329s > > > 6548 undefined > > > 772 undefined_symbols > > > > > > Both tests were done against this tree (based on today's linux-next): > > > > > > $ https://git.kernel.org/pub/scm/linux/kernel/git/mchehab/devel.git/log/?h=get_abi_undefined-latest > > > > > > It should be noticed that, as my tree has several ABI fixes, the time to run the > > > script is likely less than if you run on your tree, as there will be less symbols to > > > be reported, and the algorithm is optimized to reduce the number of regexes > > > when a symbol is found. > > > > > > Besides optimizing and improving the seek logic, this series also change the > > > debug logic. It how receives a bitmap, where "8" means to print the regexes > > > that will be used by "undefined" command: > > > > > > $ time ./scripts/get_abi.pl undefined --debug 8 >foo > > > real 0m17,189s > > > user 0m13,940s > > > sys 0m2,404s > > > > > > $wc -l foo > > > 18421939 foo > > > > > > $ cat foo > > > ... > > > /sys/kernel/kexec_crash_loaded =~ /^(?^:^/sys/.*/iio\:device.*/in_voltage.*_scale_available$)$/ > > > /sys/kernel/kexec_crash_loaded =~ /^(?^:^/sys/.*/iio\:device.*/out_voltage.*_scale_available$)$/ > > > /sys/kernel/kexec_crash_loaded =~ /^(?^:^/sys/.*/iio\:device.*/out_altvoltage.*_scale_available$)$/ > > > /sys/kernel/kexec_crash_loaded =~ /^(?^:^/sys/.*/iio\:device.*/in_pressure.*_scale_available$)$/ > > > ... > > > > > > On other words, on my desktop, the /sys match is performing >18M regular > > > expression searches, which takes 6,2 seconds (or 17,2 seconds, if debug is > > > enabled and sent to an area on my nvme storage). > > > > Better, it's down to 10 minutes on my machine now: > > > > real 10m39.218s > > user 10m37.742s > > sys 0m0.775s > > A lot better, but not clear why it is still taking ~40x more than here... > It could well be due to the other ABI changes yet to be applied > (I'll submit it probably later today), but it could also be related to > something else. Could this be due to disk writes? Disk writes to where for what? This is a very fast disk (nvme raid array) It's also a very "big" system, with lots of sysfs files: $ find /sys/devices/ -type f | wc -l 44334 compared to my laptop that only has 17k entries in /sys/devices/ I'll run this updated script on my laptop later today and give you some numbers. And any Documentation/ABI/ updates you might have I'll gladly take as well. thanks, greg k-h
