On Wed, Jul 24, 2019 at 12:17 AM Doug Anderson <diand...@chromium.org> wrote: > > Hi, > > On Tue, Jul 23, 2019 at 1:21 AM Dmitry Vyukov <dvyu...@google.com> wrote: > > > > On Tue, Jul 23, 2019 at 10:13 AM Nicolas Boichat <drink...@chromium.org> > > wrote: > > > > > > On Tue, Jul 23, 2019 at 3:46 PM Dmitry Vyukov <dvyu...@google.com> wrote: > > > > > > > > On Tue, Jul 23, 2019 at 9:26 AM Nicolas Boichat <drink...@chromium.org> > > > > wrote: > > > > > > > > > > When KASan is enabled, a lot of memory is allocated early on, > > > > > and kmemleak complains (this is on a 4GB RAM system): > > > > > kmemleak: Early log buffer exceeded (129846), please increase > > > > > DEBUG_KMEMLEAK_EARLY_LOG_SIZE > > > > > > > > > > Let's increase the upper limit to 1M entry. That would take up > > > > > 160MB of RAM at init (each early_log entry is 160 bytes), but > > > > > the memory would later be freed (early_log is __initdata). > > > > > > > > Interesting. Is it on an arm64 system? > > > > > > Yes arm64. And this is chromiumos-4.19 tree. I didn't try to track > > > down where these allocations come from... > > > > So perhaps it's due to arm64, or you have even more configs, or maybe > > running on real hardware. But I guess it's fine as is, just wondered > > why such a radical difference. Thanks. > > If I had to guess I'd guess gcc vs. clang. I think we've noticed a > few places where clang+kasan produces much bloatier code than > gcc+kasan. Oh look, I just invented a new word: bloatier. :-P > > ...could you try building with gcc and see if that explains the problems?
Just in case, there is no problem per se. There is just a difference :) Whom have you asked? We use gcc with KEMEMLEAK atm. But compiler should not affect number of kernel heap allocations.