On Wed, Mar 16, 2011 at 11:37:29AM +0800, Shaohua Li wrote: > According to intel CPU manual, every time PGD entry is changed in i386 PAE mode, > we need do a full TLB flush. Current code follows this and there is comment > for this too in the code. But current code misses the multi-threaded case. A > changed page table might be used by several CPUs, every such CPU should flush > TLB. > Usually this isn't a problem, because we prepopulate all PGD entries at process > fork. But when the process does munmap and follows new mmap, this issue will be > triggered. When it happens, some CPUs will keep doing page fault. > > See: http://marc.info/?l=linux-kernel&m=129915020508238&w=2 > > Reported-by: Yasunori Goto<y-goto@xxxxxxxxxxxxxx> > Signed-off-by: Shaohua Li<shaohua.li@xxxxxxxxx> > Tested-by: Yasunori Goto<y-goto@xxxxxxxxxxxxxx> This is not how you submit something to the stable kernel tree. Please go read Documentation/stable_kernel_rules.txt for how to do it properly. thanks, greg k-h -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>