On 2014.10.27 at 23:01 +0100, Vlastimil Babka wrote: > On 10/27/2014 09:40 PM, Markus Trippelsdorf wrote: > > On my v3.18-rc2 kernel isolate_freepages_block() sometimes shows up very > > high (>20%) in perf top during the configuration phase of software > > builds. It increases build time considerably. > > > > Unfortunately the issue is not 100% reproducible, because it appears > > only intermittently. And the symptoms vanish after a few minutes. > > Does it happen for long enough so you can capture it by perf record -g ? It only happens when I use the "Lockless Allocator": http://locklessinc.com/downloads/lockless_allocator_src.tgz I use: LD_PRELOAD=/usr/lib/libllalloc.so.1.3 when building software, because it gives me a ~8% speed boost over glibc's malloc. Unfortunately, I don't have time to debug this further and have disabled "Transparent Hugepage Support" for now. -- Markus -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>