On 2016/3/30 15:16, Xishi Qiu wrote: > On 2016/3/22 22:47, Shakeel Butt wrote: > >> >> On Tue, Mar 22, 2016 at 6:55 AM, Xishi Qiu <[email protected] >> <mailto:[email protected]>> wrote: >> >> [root@localhost c_test]# cat /proc/3948/smaps | grep Rss >> >> The /proc/[pid]/smaps read triggers the traversal of all of process's vmas >> and then page tables and accumulate RSS on each present page table entry. >> >> [root@localhost c_test]# cat /proc/3948/statm >> 1042 173 154 1 0 48 0 >> >> The files /proc/[pid]/statm and /proc/[pid]/status uses the counters >> (MM_ANONPAGES & MM_FILEPAGES) in mm_struct to report RSS of a process. These >> counters are modified on page table modifications. However the kernel >> implements an optimization where each thread keeps a local copy of these >> counters in its task_struct. These local counter are accumulated in the >> shared counter of mm_struct after some number of page faults (I think 32) >> faced by the thread and thus there will be mismatch with smaps file. >> >> Shakeel >
Hi Shakeel, I misunderstand your meaning before. I know the reason now. Thanks, Xishi Qiu > Hi Shakeel, > > I malloc and memset 10M, then sleep. It seems that the problem is still exist, > the kernel version is v4.1 >
