The code changes look big, have you looked at
http://marc.theaimsgroup.com/?l=linux-kernel&m=113817279225962&w=2
No I haven't. I like it.
- Holding the semaphore shouldn't be a problem.
- calling down_read_trylock ought to be fast
- I *think* the unwanted calls to prune_dcache are always under
PF_MEMALLOC - they certainly seem to be.
No, it looks as it is not :(
Have you noticed my comment about "count" argument to prune_dcache()?
For example, prune_dcache() is called from shrink_dcache_parent() which
is called in many places and not all of them have PF_MEMALLOC or
s_umount semaphore for write. But prune_dcache() doesn't care for super
blocks etc. It simply shrinks N dentries which are found _first_.
So the condition:
+ if ((current->flags & PF_MEMALLOC) &&
+ !(ret = down_read_trylock(&s->s_umount))) {
is not always true when the race occurs, as PF_MEMALLOC is not always set.
And it is a nice small change.
Have you had any other feedback on this?
here it is :)
Thanks,
Kirill
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
