[lkml]   [2001]   [Aug]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: find_get_swapcache_page() question
On Tue, 28 Aug 2001, Rik van Riel wrote:
> On Tue, 28 Aug 2001, Hugh Dickins wrote:
> > if (!PageSwapCache(found))
> > BUG();
> > if (found->mapping != &swapper_space)
> > BUG();
> > are not safe, since there may a concurrent remove_from_swap_cache(),
> > either from try_to_unuse() or from Rik's new vm_swap_full() deletion.
> > Those tests would be safe if the page were locked, but it's not.
> vm_swap_full() is called with the page locked,
> remove_from_swap_cache() also seems to want the
> page locked...

Certainly (I seem to recall composing a comment to that effect
recently :-)! Sorry for being unclear, I meant that those tests
in lookup_swap_cache() are made without the page being locked
by lookup_swap_cache() or its caller (and I'm not proposing
that the page should be locked, but the unsafe tests removed).


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

 \ /
  Last update: 2005-03-22 12:58    [W:0.058 / U:1.040 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site