----- Original Message ----- > 于 2013年03月02日 05:20, Dave Anderson 写道: > > > > > > ----- Original Message ----- > >> kmem -m is used for displaying information of all ksm pages or > >> some ksm pages for specified ksm stable tree node addresses > >> The information includes: > >> - physical address of ksm page, > >> - pid of tasks using this ksm page, > >> - counts of ksm page references for each task > >> > >> for example: > >> crash> kmem -m ffff8803573964c0 > >> PID: 15864 16781 > >> 793005000: 8713 5584 > >> > >> ffff8803573964c0 is the address of ksm stable tree node. > >> task 15864 has 8713 virtual pages mapping the page with address 793005000. > >> task 16781 has 5584 virtual pages mapping the page with address 793005000. > >> > >> P.S. > >> This patch is based on the patch from > >> Qiao(qiaonuohan@xxxxxxxxxxxxxx) > >> 0001-make-rbtree-manipulation-functions-global.patch > >> Because this patch also uses rb_tree operations. > > > > I'll get to this patch after I get Qiao's patch straightened out and > > checked in. > > > > But a couple quick questions... > > > > What does "kmem -m" alone look like? Your help page example only > > shows the command passing a "ksm stable tree node address". > > 'kmem -m' will display all the ksm pages. I meant could you show an example of "kmem -m"... > > > How would a user know what one of those addresses would be? > > From the structure "rmap_item" ? it has a member "head" that points > to a ksm stable tree node. So does "kmem -m" show a list of those addresses? > > > > And for "kmem -m <address>", what if there are dozens of PIDs that > > are mapping the same physical address? Regardless of the size of > > the display window, eventually it would get messy if it extends to > > more than one line. I try to avoid having commands extend beyond > > 80 columns if at all possible. > > > > Hmm. If there are quite many PIDs, can the output be like below? > > PID: 15864 16781 16782 16783 > 793005000: 8713 5584 23 23 > 12222 13333 14444 15555 > 232 232 334 456 > ... Well, that's not much clearer -- it's difficult to tell whether the numbers are PIDs or counts. Dave -- Crash-utility mailing list Crash-utility@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/crash-utility