Messages in this thread Patch in this message | | | Date | Sat, 01 Nov 1997 12:39:52 -0500 | From | Bill Hawes <> | Subject | Re: Odd swap behavior in 2.1.60 |
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tenthumbs@cybernex.net wrote: > No good. Now I get large numbers of > try_to_unuse: entry %08lx not in use messages. > from your patch. > > It's still true that the appearance of the "d_alloc: ... pruning dcache" > messages is a prerequisite as well as swapping into the second partition.
I'm interested in tracking this down, as it seems to indicate that the system is losing track of what pages are swapped out. I've attached a very small patch (against 2.1.61) that will give some additional information about the "not in use" swap pages. The experiment I'd like you to try is as follows.
Apply the patch, then do whatever normally starts swapping into your second swapfile. When this happens, do a swapoff on your _first_ swapfile. This should generate lots of additional swapping, and will show which pages weren't found in the first swapfile. (And you'll be able to capture the messages in your syslog.)
Now turn swapping on for the first file, and try a swapoff on the second.
After this, just snip the messages from your log so we can see how many and what entries aren't being found.
Regards, Bill--- mm/swapfile.c.old Fri Oct 31 00:26:08 1997 +++ mm/swapfile.c Fri Oct 31 14:24:53 1997 @@ -350,8 +350,9 @@ */ if (si->swap_map[i] != 0) { if (si->swap_map[i] != 127) - printk("try_to_unuse: entry %08lx " - "not in use\n", entry); + printk("try_to_unuse: %d not used, " + "count=%d, entry=%lx\n", + i, si->swap_map[i], entry); si->swap_map[i] = 0; nr_swap_pages++; } | |