On Thu, Dec 03, 2020 at 06:10:15PM +0100, Peter Zijlstra wrote:
On Thu, Dec 03, 2020 at 03:54:42PM +0100, Heiko Carstens wrote:
On Thu, Dec 03, 2020 at 08:28:21AM -0500, Sasha Levin wrote:
> From: Peter Zijlstra
>
> [ Upstream commit 58c644ba512cfbc2e39b758dd979edd1d6d00e27 ]
>
> We call arch_c
On 12/13/20 10:26 AM, Vincent Stehlé wrote:
> The DMA address returned by dma_map_single() should be checked with
> dma_mapping_error(). Fix the ps3stor_setup() function accordingly.
>
> Fixes: 80071802cb9c ("[POWERPC] PS3: Storage Driver Core")
> Signed-off-by: Vincent Stehlé
> Cc: Geoff Levand
On Sun, Dec 13, 2020 at 8:06 PM Vincent Stehlé
wrote:
> The DMA address returned by dma_map_single() should be checked with
> dma_mapping_error(). Fix the ps3stor_setup() function accordingly.
>
> Fixes: 80071802cb9c ("[POWERPC] PS3: Storage Driver Core")
> Signed-off-by: Vincent Stehlé
Reviewed
This is a bug that can cause early crashes in configurations with a
.exit.text section smaller than a page and a .init.text section that
ends in the beginning of a physical page (this is kinda random, which
might explain why this wasn't really encountered before).
The init sections are ordered lik
The DMA address returned by dma_map_single() should be checked with
dma_mapping_error(). Fix the ps3stor_setup() function accordingly.
Fixes: 80071802cb9c ("[POWERPC] PS3: Storage Driver Core")
Signed-off-by: Vincent Stehlé
Cc: Geoff Levand
Cc: Geert Uytterhoeven
---
drivers/ps3/ps3stor_lib.c
On Tue, Jul 07, 2020 at 01:31:37PM +0800, Chinwen Chang wrote:
[..]
> > > Hi Laurent,
> > >
> > > We merged SPF v11 and some patches from v12 into our platforms. After
> > > several experiments, we observed SPF has obvious improvements on the
> > > launch time of applications, especially for those
Warning in current branch:
arch/powerpc/kernel/vdso32/vgettimeofday.c:13:5: warning: no previous prototype
for function '__c_kernel_clock_gettime64' [-Wmissing-prototypes]
Warning ids grouped by kconfigs:
clang_recent_errors
`-- powerpc64-randconfig-r025-20201213
`--
arch-powe
Excerpts from Andy Lutomirski's message of December 11, 2020 10:11 am:
>> On Dec 5, 2020, at 7:59 PM, Nicholas Piggin wrote:
>>
>
>> I'm still going to persue shoot-lazies for the merge window. As you
>> see it's about a dozen lines and a if (IS_ENABLED(... in core code.
>> Your change is common
Excerpts from Geert Uytterhoeven's message of December 10, 2020 7:06 pm:
> Hi Nicholas,
>
> On Fri, Nov 20, 2020 at 4:01 AM Nicholas Piggin wrote:
>>
>> When offlining a CPU, powerpc/64s does not flush TLBs, rather it just
>> leaves the CPU set in mm_cpumasks, so it continues to receive TLBIEs
>>
Excerpts from Nicholas Piggin's message of December 14, 2020 2:07 pm:
> Excerpts from Andy Lutomirski's message of December 11, 2020 10:11 am:
>>> On Dec 5, 2020, at 7:59 PM, Nicholas Piggin wrote:
>>>
>>
>>> I'm still going to persue shoot-lazies for the merge window. As you
>>> see it's about a
This is another rebase, on top of mainline now (don't need the
asm-generic tree), and without any x86 or membarrier changes.
This makes the series far smaller and more manageable and
without the controversial bits.
Thanks,
Nick
Nicholas Piggin (5):
lazy tlb: introduce lazy mm refcount helper fu
Add explicit _lazy_tlb annotated functions for lazy mm refcounting.
This makes things a bit more explicit, and allows explicit refcounting
to be removed if it is not used.
Signed-off-by: Nicholas Piggin
---
arch/arm/mach-rpc/ecard.c| 2 +-
arch/powerpc/mm/book3s64/radix_tlb.c | 4 +
Add CONFIG_MMU_LAZY_TLB which can be configured out to disable
the lazy tlb mechanism entirely, and switches to init_mm when
switching to a kernel thread.
NOMMU systems could easily go without this and save a bit of code
and the refcount atomics, because their mm switch is a no-op. They
have not b
On big systems, the mm refcount can become highly contented when doing
a lot of context switching with threaded applications (particularly
switching between the idle thread and an application thread).
Abandoning lazy tlb slows switching down quite a bit in the important
user->idle->user cases, so
Use _lazy_tlb functions for lazy mm refcounting in powerpc, to prepare
to move to MMU_LAZY_TLB_SHOOTDOWN.
Signed-off-by: Nicholas Piggin
---
arch/powerpc/kernel/smp.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index 8
On a 16-socket 192-core POWER8 system, a context switching benchmark
with as many software threads as CPUs (so each switch will go in and
out of idle), upstream can achieve a rate of about 1 million context
switches per second. After this patch it goes up to 118 million.
Signed-off-by: Nicholas Pi
On 12/13/20 10:53 PM, Nicholas Piggin wrote:
> diff --git a/arch/Kconfig b/arch/Kconfig
> index 84faaba66364..e69c974369cc 100644
> --- a/arch/Kconfig
> +++ b/arch/Kconfig
> @@ -443,9 +443,22 @@ config MMU_LAZY_TLB
> config MMU_LAZY_TLB_REFCOUNT
> def_bool y
> depends on MMU_LAZY_TLB
>
Kernel call these functions on cpu online and hence they should
not be marked __init.
Signed-off-by: Aneesh Kumar K.V
---
arch/powerpc/mm/book3s32/mmu.c | 4 ++--
arch/powerpc/mm/book3s64/pkeys.c | 4 ++--
arch/powerpc/mm/init-common.c| 2 +-
arch/powerpc/mm/nohash/8xx.c | 4 ++--
4 fi
Le 14/12/2020 à 08:13, Aneesh Kumar K.V a écrit :
Kernel call these functions on cpu online and hence they should
not be marked __init.
This is PPC64 only.
See commit
https://github.com/linuxppc/linux/commit/67d53f30e23ec66aa7bbdd1592d5e64d46876190#diff-9799ddc8e77e666295031a560afc2a754d2f
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