Ram Pai writes:
> --- a/arch/powerpc/mm/pkeys.c
> +++ b/arch/powerpc/mm/pkeys.c
> @@ -97,3 +97,60 @@ int __arch_set_user_pkey_access(struct task_struct *tsk,
> int pkey,
> init_iamr(pkey, new_iamr_bits);
> return 0;
> }
> +
> +static inline bool pkey_allows_readwrite(int pkey)
> +{
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On Fri, Jul 28, 2017 at 4:13 PM, Bandan Das wrote:
> Jintack Lim writes:
> ...
>>>
>>> I'll share my experiment setup shortly.
>>
>> I summarized my experiment setup here.
>>
>> https://github.com/columbia/nesting-pub/wiki/Nested-virtualization-on-ARM-setup
>
> Thanks Jintack! I was able to test
Ram Pai writes:
> --- a/arch/powerpc/mm/pkeys.c
> +++ b/arch/powerpc/mm/pkeys.c
> @@ -201,3 +201,36 @@ int __arch_override_mprotect_pkey(struct vm_area_struct
> *vma, int prot,
>*/
> return vma_pkey(vma);
> }
> +
> +static bool pkey_access_permitted(int pkey, bool write, bool exec
Jintack Lim writes:
...
>>
>> I'll share my experiment setup shortly.
>
> I summarized my experiment setup here.
>
> https://github.com/columbia/nesting-pub/wiki/Nested-virtualization-on-ARM-setup
Thanks Jintack! I was able to test L2 boot up with these instructions.
Next, I will try to run some
The number of positive dentries is limited by the number of files
in the filesystems. The number of negative dentries, however,
has no limit other than the total amount of memory available in
the system. So a rogue application that generates a lot of negative
dentries can potentially exhaust most o
The number of negative dentries currently in the system is now reported
in the /proc/sys/fs/dentry-state file.
Signed-off-by: Waiman Long
---
fs/dcache.c| 16 +++-
include/linux/dcache.h | 7 ---
2 files changed, 19 insertions(+), 4 deletions(-)
diff --git a/fs/dcac
The negative dentry pruning is done on a specific super_block set
in the ndblk.prune_sb variable. If the super_block is also being
un-mounted concurrently, the content of the super_block may no longer
be valid.
To protect against such racing condition, a new lock is added to
the ndblk structure to
There is performance concern about killing recently created negative
dentries. This should rarely happen under normal working condition. To
understand the extent of how often this negative dentry killing is
happening, the /proc/sys/fs/denty-state file is extended to track this
number. This allows u
Having a limit for the number of negative dentries may have an
undesirable side effect that no new negative dentries will be allowed
when the limit is reached. This may have a performance impact on some
workloads.
To prevent this from happening, we need a way to prune the negative
dentries so that
v2->v3:
- Add a faster pruning rate when the free pool is closed to depletion.
- As suggested by James Bottomley, add an artificial delay waiting
loop before killing a negative dentry and properly clear the
DCACHE_KILL_NEGATIVE flag if killing doesn't happen.
- Add a new patch to tra
On Fri, 28 Jul 2017, Prarit Bhargava wrote:
> On 07/25/2017 09:00 AM, Peter Zijlstra wrote:
> Thanks for the above change. I can see that makes the code simpler.
>
> > Although I must strongly discourage using REALTIME, DST will make
> > untangling your logs an absolute nightmare. I would simply
Hello,
On Fri, Jul 28, 2017 at 02:01:55PM +0100, Roman Gushchin wrote:
> > > + nr_dying_descendants
> > > + Total number of dying descendant cgroups.
> >
> > Can you please go into more detail on what's going on with dying
> > descendants here?
>
> Sure.
> Don't we plan do describe cgro
On 07/25/2017 09:00 AM, Peter Zijlstra wrote:
> On Tue, Jul 25, 2017 at 08:17:27AM -0400, Prarit Bhargava wrote:
>> diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
>> index 5b1662ec546f..6cd38a25f8ea 100644
>> --- a/lib/Kconfig.debug
>> +++ b/lib/Kconfig.debug
>> @@ -1,8 +1,8 @@
>> menu "prin
On Fri, Jul 28, 2017 at 01:08:25PM +0200, Egil Hjelmeland wrote:
> On 26. juli 2017 18:55, Andrew Lunn wrote:
> >On Tue, Jul 25, 2017 at 06:15:44PM +0200, Egil Hjelmeland wrote:
> >It is better to use mdiobus_read/write or if you are nesting mdio
> >busses, mdiobus_read_nested/mdiobus_write_nested.
On Thu, Jul 27, 2017 at 12:22:43PM -0400, Tejun Heo wrote:
> Hello,
>
> On Thu, Jul 27, 2017 at 05:14:20PM +0100, Roman Gushchin wrote:
> > Add a cgroup.stat interface to the base cgroup control files
> > with the following metrics:
> >
> > nr_descendants total number of descendant c
On 26. juli 2017 18:55, Andrew Lunn wrote:
On Tue, Jul 25, 2017 at 06:15:44PM +0200, Egil Hjelmeland wrote:
It is better to use mdiobus_read/write or if you are nesting mdio
busses, mdiobus_read_nested/mdiobus_write_nested. Please test this
code with lockdep enabled.
I have CONFIG_DEBUG_SPINLO
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