Dear Fengguang, > There are 260MB reclaimable slab pages in the normal zone ... Marked "all_unreclaimable? yes": is that wrong? Question asked also in: http://marc.info/?l=linux-mm&m=135873981326767&w=2 > ... however we somehow failed to reclaim them. ... I made a patch that would do a drop_caches at that point, please see: http://bugs.debian.org/695182 http://bugs.debian.org/cgi-bin/bugreport.cgi?msg=101;filename=drop_caches.patch;att=1;bug=695182 http://marc.info/?l=linux-mm&m=135785511125549&w=2 and that successfully avoided OOM when writing files. But, the drop_caches patch did not protect against the "sleep test". > ... What's your filesystem and the content of /proc/slabinfo? Filesystem is EXT3. See output of slabinfo in Debian bug above or in http://marc.info/?l=linux-mm&m=135796154427544&w=2 Thanks, Paul Paul Szabo psz@xxxxxxxxxxxxxxxxx http://www.maths.usyd.edu.au/u/psz/ School of Mathematics and Statistics University of Sydney Australia -- 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>