[lkml]   [2000]   [Sep]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectTwo VM problems for the 2.4 TODO list
Hi Ted,

To be fixed for 2.4:

1) Non-atomic pte updates

The page aging code and mprotect both modify existing ptes
non-atomically. That can stomp on the VM hardware on other CPUs
setting the dirty bit on mmaped pages when using threads. 2.2 is
vulnerable too.

2) RSS locking

swapout holds the page_table_lock while swapping, and adjusts the
mm->rss while holding that lock. Other places in the mm are not
so careful about holding the lock, so rss (which is not an
atomic_t) can be corrupted.


To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
Please read the FAQ at

 \ /
  Last update: 2005-03-22 12:38    [W:0.018 / U:2.940 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site