On Sat, 27 Aug 2011 12:32:01 +0300
Konstantin Khlebnikov [off-list ref] wrote:

After commit v2.6.36-5896-gd065bd8 "mm: retry page fault when blocking on disk transfer"
we usually wait in page-faults without mmap_sem held, so all swap-token logic was broken,
because it based on using rwsem_is_locked(&mm->mmap_sem) as sign of in progress page-faults.

If I'm interpreting this correctly, the thrash-handling logic has been
effectively disabled for a year and nobody noticed.

This patch adds to mm_struct atomic counter of in progress page-faults for mm with swap-token.

We desperately need to delete some code from mm/.  This seems like a
great candidate.  Someone prove me wrong?

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  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@kvack.org"> email@kvack.org </a>