On 2022/11/15 16:33, Zhen Lei wrote: > Added test cases for basic functions and performance of functions > kallsyms_lookup_name(), kallsyms_on_each_symbol() and > kallsyms_on_each_match_symbol(). It also calculates the compression rate > of the kallsyms compression algorithm for the current symbol set. > > The basic functions test begins by testing a set of symbols whose address > values are known. Then, traverse all symbol addresses and find the > corresponding symbol name based on the address. It's impossible to > determine whether these addresses are correct, but we can use the above > three functions along with the addresses to test each other. Due to the > traversal operation of kallsyms_on_each_symbol() is too slow, only 60 > symbols can be tested in one second, so let it test on average once > every 128 symbols. The other two functions validate all symbols. > > If the basic functions test is passed, print only performance test > results. If the test fails, print error information, but do not perform > subsequent performance tests. > > Start self-test automatically after system startup if > CONFIG_KALLSYMS_SELFTEST=y. > > Example of output content: (prefix 'kallsyms_selftest:' is omitted > start > --------------------------------------------------------- > | nr_symbols | compressed size | original size | ratio(%) | > |---------------------------------------------------------| > | 107543 | 1357912 | 2407433 | 56.40 | > --------------------------------------------------------- > kallsyms_lookup_name() looked up 107543 symbols > The time spent on each symbol is (ns): min=630, max=35295, avg=7353 > kallsyms_on_each_symbol() traverse all: 11782628 ns > kallsyms_on_each_match_symbol() traverse all: 9261 ns > finish > > Signed-off-by: Zhen Lei <thunder.leizhen@xxxxxxxxxx> > --- > include/linux/kallsyms.h | 1 + > init/Kconfig | 13 + > kernel/Makefile | 1 + > kernel/kallsyms.c | 2 +- > kernel/kallsyms_selftest.c | 485 +++++++++++++++++++++++++++++++++++++ > kernel/kallsyms_selftest.h | 13 + > 6 files changed, 514 insertions(+), 1 deletion(-) > create mode 100644 kernel/kallsyms_selftest.c > create mode 100644 kernel/kallsyms_selftest.h v8 --> v9: [v8] https://lkml.org/lkml/2022/11/2/225 Adjust the prototype of some callback functions. Because 7/9 and 8/9 in v8 are dropped. -- Regards, Zhen Lei
