, I could see munmap's time reduction from 275
seconds to 418ms.
> Leonardo Bras (11):
> powerpc/mm: Adds counting method to monitor lockless pgtable walks
> asm-generic/pgtable: Adds dummy functions to monitor lockless pgtable
> walks
> mm/gup: Applies counting method to mon
On Fri, 2019-09-20 at 16:50 -0300, Leonardo Bras wrote:
> *** BLURB HERE ***
Sorry, something gone terribly wrong with my cover letter.
I will try to find it and send here, or rewrite it.
Best regards,
signature.asc
Description: This is a digitally signed message part
Applies the counting-based method for monitoring all book3s_64-related
functions that do lockless pagetable walks.
Signed-off-by: Leonardo Bras
---
It may be necessary to merge an older patch first:
powerpc: kvm: Reduce calls to get current->mm by storing the value locally
Link:
ht
Skips slow part of serialize_against_pte_lookup if there is no running
lockless pagetable walk.
Signed-off-by: Leonardo Bras
---
arch/powerpc/mm/book3s64/pgtable.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/mm/book3s64/pgtable.c
b/arch/powerpc/mm
Enables count-based monitoring method for lockless pagetable walks on
PowerPC book3s_64.
Other architectures/platforms fallback to using generic dummy functions.
Signed-off-by: Leonardo Bras
---
arch/powerpc/include/asm/book3s/64/pgtable.h | 5 +
1 file changed, 5 insertions(+)
diff --git
Applies the counting-based method for monitoring all book3s_hv related
functions that do lockless pagetable walks.
Signed-off-by: Leonardo Bras
---
arch/powerpc/kvm/book3s_hv_nested.c | 8
arch/powerpc/kvm/book3s_hv_rm_mmu.c | 9 -
2 files changed, 16 insertions(+), 1 deletion
Applies the counting-based method for monitoring lockless pgtable walks on
kvmppc_e500_shadow_map().
Signed-off-by: Leonardo Bras
---
arch/powerpc/kvm/e500_mmu_host.c | 4
1 file changed, 4 insertions(+)
diff --git a/arch/powerpc/kvm/e500_mmu_host.c b/arch/powerpc/kvm/e500_mmu_host.c
Applies the counting-based method for monitoring all hash-related functions
that do lockless pagetable walks.
Signed-off-by: Leonardo Bras
---
arch/powerpc/mm/book3s64/hash_tlb.c | 2 ++
arch/powerpc/mm/book3s64/hash_utils.c | 7 +++
2 files changed, 9 insertions(+)
diff --git a/arch
Applies the counting-based method for monitoring lockless pgtable walks on
read_user_stack_slow.
Signed-off-by: Leonardo Bras
---
arch/powerpc/perf/callchain.c | 5 -
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/perf/callchain.c b/arch/powerpc/perf/callchain.c
Applies the counting-based method for monitoring lockless pgtable walks on
addr_to_pfn().
Signed-off-by: Leonardo Bras
---
arch/powerpc/kernel/mce_power.c | 13 ++---
1 file changed, 10 insertions(+), 3 deletions(-)
diff --git a/arch/powerpc/kernel/mce_power.c b/arch/powerpc/kernel
approach, that
counts the number of lockless pagetable walks happening on the process.
Given that there are lockless pagetable walks on generic code, it's
necessary to create dummy functions for archs that won't use the approach.
Signed-off-by: Leonardo Bras
---
include/asm-generic/pgtable.h
this method.
Signed-off-by: Leonardo Bras
---
mm/gup.c | 4
1 file changed, 4 insertions(+)
diff --git a/mm/gup.c b/mm/gup.c
index 98f13ab37bac..675e4be27082 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -2404,6 +2404,7 @@ int get_user_pages_fast(unsigned long start, int nr_pages
*** BLURB HERE ***
Leonardo Bras (11):
powerpc/mm: Adds counting method to monitor lockless pgtable walks
asm-generic/pgtable: Adds dummy functions to monitor lockless pgtable
walks
mm/gup: Applies counting method to monitor gup_pgd_range
powerpc/mce_power: Applies counting method
end_lockless_pgtbl_walk(mm)
Insert after the end of any lockless pgtable walk
(Mostly after the ptep is last used)
running_lockless_pgtbl_walk(mm)
Returns the number of lockless pgtable walks running
Signed-off-by: Leonardo Bras
---
arch/powerpc/include/asm/book3s/64/mmu.h | 3
Hello Paul,
I sent this patch, but I have a question:
On Thu, 2019-09-19 at 19:27 -0300, Leonardo Bras wrote:
> Reduces the number of calls to get_current() in order to get the value of
> current->mm by doing it once and storing the value, since it is not
> supposed to change ins
Hello Michael,
Any feedback on this patch?
Best regards,
On Fri, 2019-08-02 at 15:45 +0200, David Hildenbrand wrote:
> On 02.08.19 15:39, Leonardo Bras wrote:
> > Changes the return variable to bool (as the return value) and
> > avoids doing a ternary operation b
Reduces the number of calls to get_current() in order to get the value of
current->mm by doing it once and storing the value, since it is not
supposed to change inside the same process).
Signed-off-by: Leonardo Bras
---
arch/powerpc/kvm/book3s_64_mmu_hv.c | 11 ++-
1 file changed
behavior.
> Move that to ppc64 specific mm_context_t.
Ok, fixed! I will send that on v2.
Best regards,
Leonardo Bras
signature.asc
Description: This is a digitally signed message part
kip smp_call_function_many().
On my workload (qemu), I could see munmap's time reduction from 275 seconds
to 418ms.
Signed-off-by: Leonardo Bras
---
I need more experienced people's help in order to understand if this is
really a valid improvement, and if mm_struct is the best place to put such
counter.
Tha
On Fri, 2019-08-02 at 09:23 +0200, David Hildenbrand wrote:
> subtle changes in a "Change rc variable to bool"
> patch should be avoided.
You are right.
If it was a valid change, I should give it a patch for itself.
I will keep that in mind next time.
Thanks for helping!
signature.asc
Changes the return variable to bool (as the return value) and
avoids doing a ternary operation before returning.
Signed-off-by: Leonardo Bras
---
Changes in v2:
- Restore previous and-ing logic on rc.
arch/powerpc/platforms/pseries/hotplug-memory.c | 6 +++---
1 file changed, 3 insertions
On Fri, 2019-08-02 at 22:26 +1000, Michael Ellerman wrote:
> Leonardo Bras writes:
> > I noticed these nested ifs can be easily replaced by switch-cases,
> > which can improve readability.
> >
> > Signed-off-by: Leonardo Bras
> > ---
> > .../platfor
Changes the return variable to bool (as the return value) and
avoids doing a ternary operation before returning.
Also, since rc will always be true, there is no need to do
rc &= bool, as (true && X) will result in X.
Signed-off-by: Leonardo Bras
---
arch/powerpc/platforms/pse
I noticed these nested ifs can be easily replaced by switch-cases,
which can improve readability.
Signed-off-by: Leonardo Bras
---
.../platforms/pseries/hotplug-memory.c| 26 +--
1 file changed, 18 insertions(+), 8 deletions(-)
diff --git a/arch/powerpc/platforms
Sorry, there is a typo on my commit message.
's/BIT_MASK/BIT/'
On Thu, 2019-06-13 at 15:02 -0300, Leonardo Bras wrote:
> The main reason of this change is to make these bitmasks more readable.
>
> The macro ASM_CONST() just appends an UL to it's parameter, so it can be
> eas
,
as it is used on .S files, just leaving the parameter as is.
However, I have noticed no difference in the generated binary after this
change.
Signed-off-by: Leonardo Bras
---
arch/powerpc/include/asm/firmware.h | 75 ++---
1 file changed, 37 insertions(+), 38 deletions(-)
diff
On Tue, 2019-06-11 at 10:44 +0530, Anshuman Khandual wrote:
>
> On 06/10/2019 08:57 PM, Leonardo Bras wrote:
> > On Mon, 2019-06-10 at 08:09 +0530, Anshuman Khandual wrote:
> > > > > +/*
> > > > > + * To be potentially processing a kprobe fault a
On Mon, 2019-06-10 at 12:02 +0530, Anju T Sudhakar wrote:
> Nest and core imc(In-memory Collection counters) assigns a particular
> cpu as the designated target for counter data collection.
> During system boot, the first online cpu in a chip gets assigned as
> the designated cpu for that chip(for
On Mon, 2019-06-10 at 08:09 +0530, Anshuman Khandual wrote:
> > > +/*
> > > + * To be potentially processing a kprobe fault and to be allowed
> > > + * to call kprobe_running(), we have to be non-preemptible.
> > > + */
> > > +if (kprobes_built_in() && !preemptible() &&
On Thu, 2019-06-06 at 14:36 -0300, Claudio Carvalho wrote:
> From: Anshuman Khandual
>
> CONFIG_PPC_UV adds support for ultravisor.
>
> Signed-off-by: Anshuman Khandual
> Signed-off-by: Bharata B Rao
> Signed-off-by: Ram Pai
> [Update config help and commit message]
> Signed-off-by:
neesh Kumar K.V"
Cc: kvm-...@vger.kernel.org
Cc: linuxppc-dev@lists.ozlabs.org
Signed-off-by: Nicholas Piggin
Signed-off-by: Paul Mackerras
(cherry picked from commit 71d29f43b6332badc5598c656616a62575e83342 v4.19)
Signed-off-by: Leonardo Bras
---
arch/powerpc/kvm/book3s_64_mmu_ra
nel.org
Cc: linuxppc-dev@lists.ozlabs.org
Signed-off-by: Nicholas Piggin
Signed-off-by: Paul Mackerras
Signed-off-by: Leonardo Bras
---
arch/powerpc/kvm/book3s_64_mmu_radix.c | 91 +++---
1 file changed, 37 insertions(+), 54 deletions(-)
diff --git a/arch/powerpc/kvm/book3s_64_mmu_
From: Nicholas Piggin
THP paths can defer splitting compound pages until after the actual
remap and TLB flushes to split a huge PMD/PUD. This causes radix
partition scope page table mappings to get out of synch with the host
qemu page table mappings.
This results in random memory corruption in
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