On 2023/9/7 08:43, Shuai Xue wrote: > The maximum AUX area is limited by the page size of the system. Update > the documentation to reflect this. > > Signed-off-by: Shuai Xue <xueshuai@xxxxxxxxxxxxxxxxx> > --- > tools/perf/Documentation/perf-record.txt | 11 +++++++++++ > 1 file changed, 11 insertions(+) > > diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt > index 680396c56bd1..dfc322d6f1f1 100644 > --- a/tools/perf/Documentation/perf-record.txt > +++ b/tools/perf/Documentation/perf-record.txt > @@ -292,6 +292,17 @@ OPTIONS > Also, by adding a comma, the number of mmap pages for AUX > area tracing can be specified. > > + The maximum AUX area is limited by the maximum physically contiguous > + memory allocated from slab/slub. It can be calculated with following > + formula: > + > + PAGE_SIZE << MAX_ORDER > + ( ---------------------- ) * PAGE_SIZE > + sizeof(page_pointer) > + > + For example with 4K pages and MAX_ORDER=10 configured, the maximum AUX > + area is 2GiB. > + > -g:: > Enables call-graph (stack chain/backtrace) recording for both > kernel space and user space. Hi, Namhyung, Since PATCH [1/2] of this series has been merge into perf/core[1], are you happy to pick this part [2/2] into perf-tools-next? Thank you. Best Regards, Shuai [1] https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?h=perf/core&id=54aee5f15b83437f23b2b2469bcf21bdd9823916
