Re: [PATCH 0/6] Use two zonelists per node instead of multiple zonelists v11r2

On Wed, 12 Dec 2007 16:32:51 -0500
Lee Schermerhorn <[email protected]> wrote:

> Just this afternoon, I hit a null pointer deref in
> __mem_cgroup_remove_list() [called from mem_cgroup_uncharge() if I can
> trust the stack trace] attempting to unmap a page for migration.  I'm
> just starting to investigate this.
> 
> I'll replace the series I have [~V10] with V11r2 and continue testing in
> anticipation of the day that we can get this into -mm.
> 
Hi, Lee-san.

Could you know what is the caller of page migration ?
system call ? hot removal ? or some new thing ?

Note: 2.6.24-rc4-mm1's cgroup/migration logic.

In 2.6.24-rc4-mm1, in page migration, mem_cgroup_prepare_migration() increments
page_cgroup's refcnt before calling try_to_unmap(). This extra refcnt guarantees 
the page_cgroup's refcnt will not drop to 0 in sequence of
unmap_and_move() -> try_to_unmap() -> page_remove_rmap() -> mem_cgroup_unchage(). 

Thanks,
-Kame

--
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/

---

• Follow-Ups:
  • Re: [PATCH 0/6] Use two zonelists per node instead of multiple zonelists v11r2
    • From: Lee Schermerhorn <[email protected]>

• References:
  • [PATCH 0/6] Use two zonelists per node instead of multiple zonelists v11r2
    • From: Mel Gorman <[email protected]>
  • Re: [PATCH 0/6] Use two zonelists per node instead of multiple zonelists v11r2
    • From: Lee Schermerhorn <[email protected]>

• Prev by Date: Re: [PATCH] Add support for the S-35390A RTC chip.
• Next by Date: Re: Linux kernel history from 0.0.1
• Previous by thread: Re: [PATCH 0/6] Use two zonelists per node instead of multiple zonelists v11r2
• Next by thread: Re: [PATCH 0/6] Use two zonelists per node instead of multiple zonelists v11r2
• Index(es):
  • Date
  • Thread

[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]