On 2014.11.06 at 12:42 +0100, Vlastimil Babka wrote: > On 10/28/2014 09:59 AM, Markus Trippelsdorf wrote: > > 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. > > I tried the allocator while updating my gentoo desktop with 3.18-rc3 and adding > some extra memory pressure, but didn't observe anything like this. It could be > system specific. If you do't have the time to debug, can you at least send me > output of "cat /proc/zoneinfo"? I will try to debug this further this weekend. BTW there is an interesting thread on LKML that might be related to this issue: https://lkml.org/lkml/2014/11/4/904 -- 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>