do cheaper
comparisons with zero instead for the code that keeps the tick on in
rcu_nmi_enter_common().
In the next patch, both of the concerns of (2) will be addressed and
then we can get rid of dynticks_nmi_nesting, however one step at a time.
Signed-off-by: Joel Fernandes (Google)
---
kernel/rcu/r
for
rcu_dyntick.
Similarly, USER, IDLE and IRQ are used for describing context in
the rcu_dyntick tracepoints. Since, "KERNEL" is not used for any
of the rcu_dyntick tracepoints, remove it from the description.
Signed-off-by: Madhuparna Bhowmik
Signed-off-by: Joel Fernandes (Google)
--
" or "IRQ".
(2) Remove the "++=" and "--=" strings and replace them with
"StillNonIdle". This is much easier on the eyes, and the -- and ++
are easily apparent in the dynticks_nesting counters we are printing
anyway.
Signed-off-by: J
have been set to true in the outermost interrupt, so the nested/NMI
interrupts will check forced_tick anyway, and bail.
Signed-off-by: Joel Fernandes (Google)
---
.../Data-Structures/Data-Structures.rst | 31 ---
Documentation/RCU/stallwarn.rst | 6 +--
kernel/rcu/tree.c
This code is unused and can be removed now. Revert was straightforward.
Tested with rcutorture on all TREE configurations.
Link:
http://lore.kernel.org/r/CALCETrWNPOOdTrFabTDd=h7+wc6xj9rjceg6ol1s0rtv5pf...@mail.gmail.com
Suggested-by: Andy Lutomirski
Signed-off-by: Joel Fernandes (Google
is not a simple counter and can be "crowbarred" in
common situations.
rcutorture testing with all TREE RCU configurations succeed with
CONFIG_RCU_EQS_DEBUG=y and CONFIG_PROVE_LOCKING=y.
v1->v2:
- Rebase on v5.6-rc6
v2->v3:
- Rebase on rcu/dev with adjustments for tasks-RCU.
Joel Ferna
The following commit has been merged into the perf/core branch of tip:
Commit-ID: da97e18458fb42d7c00fac5fd1c56a3896ec666e
Gitweb:
https://git.kernel.org/tip/da97e18458fb42d7c00fac5fd1c56a3896ec666e
Author:Joel Fernandes (Google)
AuthorDate:Mon, 14 Oct 2019 13:03:08 -04
...@google.com
Cc: kernel-t...@android.com
Acked-by: James Morris
Co-developed-by: Peter Zijlstra
Suggested-by: Peter Zijlstra
Signed-off-by: Joel Fernandes (Google)
---
Changes since v1:
o Fixes from Peter Ziljstra.
o Added Ack from James Morris and Co-developed-by tag for Peter.
Changes since RFC
: rsavit...@google.com
Cc: je...@google.com
Cc: kernel-t...@android.com
Signed-off-by: Joel Fernandes (Google)
---
Changes since RFC:
o Small nits, style changes (James Morris).
o Consolidation of code (Peter Zijlstra).
arch/x86/events/intel/bts.c | 8 ++--
arch/x86/events/intel/core.c
: rsavit...@google.com
Cc: je...@google.com
Cc: kernel-t...@android.com
Signed-off-by: Joel Fernandes (Google)
---
arch/x86/events/intel/bts.c | 5 +++
arch/x86/events/intel/core.c| 5 +++
arch/x86/events/intel/p4.c | 5 +++
include/linux/lsm_hooks.h | 15
rg
Signed-off-by: Joel Fernandes (Google)
---
kernel/rcu/sync.c | 14 ++
1 file changed, 2 insertions(+), 12 deletions(-)
diff --git a/kernel/rcu/sync.c b/kernel/rcu/sync.c
index d4558ab7a07d..4f3aad67992c 100644
--- a/kernel/rcu/sync.c
+++ b/kernel/rcu/sync.c
@@ -10,7 +10,7 @@
Quite interested in the LKMM, I have submitted patches before and used
it a lot. I would like to be a part of the maintainers for this project.
Cc: Paul McKenney
Suggested-by: Alan Stern
Signed-off-by: Joel Fernandes (Google)
---
MAINTAINERS | 1 +
1 file changed, 1 insertion(+)
diff --git
plete type
struct trace_entry ent;\
Link: http://lore.kernel.org/r/20190903200905.198642-1-j...@joelfernandes.org
Acked-by: Michal Hocko
Co-developed-by: Tim Murray
Signed-off-by: Tim Murray
Signed-off-by: Joel Fernandes (Google)
---
v2->v3: Removed optimization for rate limitting and we c
binder_alloc_buffer_lookup() doesn't exist and is named
"binder_alloc_prepare_to_free()". Correct the code comments to reflect
this.
Signed-off-by: Joel Fernandes (Google)
---
drivers/android/binder_alloc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drive
Fernandes (Google)
---
v1->v2: Added more commit message.
Cc: carmenjack...@google.com
Cc: mayankgu...@google.com
Cc: dan...@google.com
Cc: rost...@goodmis.org
Cc: minc...@kernel.org
Cc: a...@linux-foundation.org
Cc: kernel-t...@android.com
include/linux/mm.h |
by mm_struct.
o Keep overhead low by checking if tracing is enabled.
o Add some noise reduction and lower overhead by emitting only on
threshold changes.
Co-developed-by: Tim Murray
Signed-off-by: Tim Murray
Signed-off-by: Joel Fernandes (Google)
---
Cc: carmenjack...@google.com
Cc: mayankgu
CONFIG_PROVE_RCU_LIST requires list_for_each_entry_rcu() to pass a
lockdep expression if using srcu or locking for protection. It can only
check regular RCU protection, all other protection needs to be passed as
lockdep expression.
Signed-off-by: Joel Fernandes (Google)
---
drivers/pci
CONFIG_PROVE_RCU_LIST requires list_for_each_entry_rcu() to pass a
lockdep expression if using srcu or locking for protection. It can only
check regular RCU protection, all other protection needs to be passed as
lockdep expression.
Signed-off-by: Joel Fernandes (Google)
---
ipc/sem.c | 3 ++-
1
more than 1 additional list did not
show any improvement.
Suggested-by: Paul E. McKenney
Signed-off-by: Joel Fernandes (Google)
---
kernel/rcu/tree.c | 80 +--
1 file changed, 56 insertions(+), 24 deletions(-)
diff --git a/kernel/rcu/tree.c b/kernel
y" handling from tree RCU as suggested by Paul which will be unused.
Based on patch:
Link: http://lore.kernel.org/r/20190814160411.58591-1-j...@joelfernandes.org
v1 series:
https://lkml.org/lkml/2019/8/27/1315
https://lore.kernel.org/patchwork/project/lkml/list/?series=408218
Jo
Now that kfree_rcu() special casing have been removed from tree RCU,
remove kfree_call_rcu_nobatch() since it is not needed.
Signed-off-by: Joel Fernandes (Google)
---
.../admin-guide/kernel-parameters.txt | 4 ---
include/linux/rcutiny.h | 5 ---
include/linux
() calls.
Signed-off-by: Joel Fernandes (Google)
---
kernel/rcu/tree.c | 8
1 file changed, 8 insertions(+)
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 2e1772469de9..de13805d1bd0 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -2757,6 +2757,7 @@ static void
Remove kfree_rcu() special casing and lazy handling from RCU.
For Tiny RCU we fold the special handling into just Tiny RCU code.
Results in a nice negative delta as well.
Suggested-by: Paul E. McKenney
Signed-off-by: Joel Fernandes (Google)
---
Documentation/RCU/stallwarn.txt | 11
by using multiple lists.
Also, when running the test, please disable CONFIG_DEBUG_PREEMPT and
CONFIG_PROVE_RCU for realistic comparisons with/without batching.
Signed-off-by: Joel Fernandes (Google)
---
.../admin-guide/kernel-parameters.txt | 17 ++
kernel/rcu/rcuperf.c
" or "IRQ".
(2) Remove the "++=" and "--=" strings and replace them with
"StillNonIdle". This is much easier on the eyes, and the -- and ++
are easily apparent in the dynticks_nesting counters we are printing
anyway.
Signed-off-by: J
This code is unused and can be removed now. Revert was straightforward.
Tested with light rcutorture.
Link:
http://lore.kernel.org/r/CALCETrWNPOOdTrFabTDd=h7+wc6xj9rjceg6ol1s0rtv5pf...@mail.gmail.com
Suggested-by: Andy Lutomirski
Signed-off-by: Joel Fernandes (Google)
---
Only made some
This code is unused and can be removed now. Revert was straightforward.
Tested with light rcutorture.
Link:
http://lore.kernel.org/r/CALCETrWNPOOdTrFabTDd=h7+wc6xj9rjceg6ol1s0rtv5pf...@mail.gmail.com
Suggested-by: Andy Lutomirski
Signed-off-by: Joel Fernandes (Google)
---
include/linux
on the previous patches to simplify rcu_dyntick
counters [1] and with these traces, I have verified the counters are
working properly.
[1]
Link: https://lore.kernel.org/patchwork/patch/1120021/
Link: https://lore.kernel.org/patchwork/patch/1120022/
Signed-off-by: Joel Fernandes (Google)
---
incl
() calls.
Signed-off-by: Joel Fernandes (Google)
---
kernel/rcu/tree.c | 8
1 file changed, 8 insertions(+)
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 9b9ae4db1c2d..64568f12641d 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -2757,6 +2757,7 @@ static void
do cheaper
comparisons with zero instead for the code that keeps the tick on in
rcu_nmi_enter_common().
In the next patch, both of the concerns of (2) will be addressed and
then we can get rid of dynticks_nmi_nesting, however one step at a time.
Signed-off-by: Joel Fernandes (Google)
---
kernel/rcu/r
lse), then the "else" block
will run to do the irq_work stuff.
This commit is based on a partial revert of d143b3d1cd89 ("rcu: Simplify
rcu_read_unlock_special() deferred wakeups") with an additional in_irq()
check added.
Signed-off-by: Joel Fernandes (Google)
---
v1-&
the "else" block
will run to do the irq_work stuff.
This commit is based on a partial revert of d143b3d1cd89 ("rcu: Simplify
rcu_read_unlock_special() deferred wakeups") with an additional in_irq()
check added.
Signed-off-by: Joel Fernandes (Google)
---
kernel/rcu/tree_plug
xchg() on a bool is causing issues on riscv and arm32. Please squash
this into the -rcu dev branch to resolve the issue.
Please squash this fix.
Fixes: -rcu dev commit 3cbd3aa7d9c7bdf ("rcu/tree: Add basic support for
kfree_rcu() batching")
Signed-off-by: Joel Fernandes (Google)
-
Sometimes I see rcu_urgent_qs is not set. This could be when the last
IPI was a long time ago, however, the grace period just started. Set
rcu_urgent_qs so the tick can indeed not be stopped.
Signed-off-by: Joel Fernandes (Google)
---
kernel/rcu/tree.c | 1 +
1 file changed, 1 insertion
Sometimes I see rcu_urgent_qs is not set. This could be when the last
IPI was a long time ago, however, the grace period just started. Set
rcu_urgent_qs so the tick can indeed be stopped.
Signed-off-by: Joel Fernandes (Google)
---
kernel/rcu/tree.c | 1 +
1 file changed, 1 insertion(+)
diff
I really cannot explain this patch, but without it, the "else if" block
just doesn't execute thus causing the tick's dep mask to not be set and
causes the tick to be turned off.
I tried various _ONCE() macros but the only thing that works is this
patch.
Signed-off-by: Joel Fernand
This commit fixes the issue.
Signed-off-by: Joel Fernandes (Google)
---
kernel/rcu/tree.c | 29 +
1 file changed, 17 insertions(+), 12 deletions(-)
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 0512de9ead20..322b1b57967c 100644
--- a/kernel/rcu/tree.c
gchul Park
Signed-off-by: Byungchul Park
Signed-off-by: Joel Fernandes (Google)
---
v3->v4: Some corrections by Paul.
Used xchg in places to simplify code.
v2->v3: Just some code comment changes thanks to Byungchul.
RFCv1->PATCH v2: Removed limits on the ->head
is
increased from HZ/50 to HZ/80.
Also, when running the test, please disable CONFIG_DEBUG_PREEMPT and
CONFIG_PROVE_RCU for realistic comparisons with/without batching.
Signed-off-by: Joel Fernandes (Google)
---
.../admin-guide/kernel-parameters.txt | 17 ++
kernel/rcu/rcuperf.c
Fernandes (Google)
---
kernel/rcu/rcuperf.c | 169 ++-
1 file changed, 168 insertions(+), 1 deletion(-)
diff --git a/kernel/rcu/rcuperf.c b/kernel/rcu/rcuperf.c
index 7a6890b23c5f..34658760da5e 100644
--- a/kernel/rcu/rcuperf.c
+++ b/kernel/rcu/rcuperf.c
ail.com
Cc: byungchul.p...@lge.com
Cc: kernel-t...@android.com
Cc: kernel-t...@lge.com
Co-developed-by: Byungchul Park
Signed-off-by: Byungchul Park
Signed-off-by: Joel Fernandes (Google)
---
kernel/rcu/tree.c | 198 --
1 file changed, 193 insert
Mauro's auto conversion broken these links, fix them.
Signed-off-by: Joel Fernandes (Google)
---
.../Tree-RCU-Memory-Ordering.rst | 17 ++--
.../RCU/Design/Requirements/Requirements.rst | 90 ---
2 files changed, 47 insertions(+), 60 deletions(-)
diff --git
This restores docs back in ReST format.
---
.../RCU/Design/Requirements/Requirements.rst | 54 +++
1 file changed, 54 insertions(+)
diff --git a/Documentation/RCU/Design/Requirements/Requirements.rst
b/Documentation/RCU/Design/Requirements/Requirements.rst
index
This reverts docs from commit 355e9972da81e803bbb825b76106ae9b358caf8e.
---
Documentation/RCU/Design/Requirements/Requirements.html | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/Documentation/RCU/Design/Requirements/Requirements.html
This series fixes the rcu/dev branch with the new ReST conversion patches.
Only changes are to documentation.
thanks,
- Joel
Joel Fernandes (Google) (6):
Revert docs from "rcu: Restore barrier() to rcu_read_lock() and
rcu_read_unlock()"
Revert docs from "t
These documents are long and have various sections. Provide a good
toc nesting level.
Signed-off-by: Joel Fernandes (Google)
---
Documentation/RCU/index.rst | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/Documentation/RCU/index.rst b/Documentation/RCU/index.rst
index
This restores docs back in ReST format.
---
Documentation/RCU/Design/Requirements/Requirements.rst | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/Documentation/RCU/Design/Requirements/Requirements.rst
b/Documentation/RCU/Design/Requirements/Requirements.rst
index
This reverts docs from commit d6b9cd7dc8e041ee83cb1362fce59a3cdb1f2709.
---
.../RCU/Design/Requirements/Requirements.html | 71 ---
1 file changed, 71 deletions(-)
diff --git a/Documentation/RCU/Design/Requirements/Requirements.html
This reverts commit 43ddb98ebe7171ff1c6e11c1616fd03726d8e9bf while
adding the documentation that the original commit added but in ReST
format.
---
.../RCU/Design/Requirements/Requirements.rst | 54 +++
kernel/rcu/tree_plugin.h | 11
2 files changed, 54
This reverts commit 355e9972da81e803bbb825b76106ae9b358caf8e.
---
Documentation/RCU/Design/Requirements/Requirements.html | 2 +-
arch/powerpc/include/asm/kvm_book3s_64.h| 2 +-
include/linux/rculist.h | 6 +++---
include/linux/rcupdate.h
These documents are long and have various sections. Provide a good
toc nesting level.
Signed-off-by: Joel Fernandes (Google)
---
Documentation/RCU/index.rst | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/Documentation/RCU/index.rst b/Documentation/RCU/index.rst
index
This reverts commit 24be1727c524b5874d5dc7828cd392cf86c3341e.
---
include/linux/rculist.h | 32
include/linux/rcupdate.h | 7 +
kernel/rcu/Kconfig.debug | 11 +++
kernel/rcu/update.c | 65 ++--
4 files changed, 88
Mauro's auto conversion broken these links, fix them.
Signed-off-by: Joel Fernandes (Google)
---
.../Tree-RCU-Memory-Ordering.rst | 17 ++--
.../RCU/Design/Requirements/Requirements.rst | 90 ---
2 files changed, 47 insertions(+), 60 deletions(-)
diff --git
This reverts commit 61d814760f1d2dffdc8db636f70bbef07c30acd5.
---
Documentation/RCU/Design/Requirements/Requirements.rst | 2 +-
arch/powerpc/include/asm/kvm_book3s_64.h | 2 +-
include/linux/rculist.h| 6 +++---
include/linux/rcupdate.h
This reverts commit 50ad3f1f9b13c8a6f2ae79df4cecb2c21da1c7c8.
---
include/linux/rculist.h | 32
include/linux/rcupdate.h | 7 -
kernel/rcu/Kconfig.debug | 11 ---
kernel/rcu/update.c | 65 ++--
4 files changed, 27
oc patches, and then applying them again. But in the
re-application, we convert the documentation
No manual fix ups were done in this process, other than to documentation.
thanks,
- Joel
And in the process I learnt about get_user() and compiler barriers ;-)
Joel Fernandes (Google) (8):
Revert "rcu:
This reverts commit d6b9cd7dc8e041ee83cb1362fce59a3cdb1f2709.
---
.../RCU/Design/Requirements/Requirements.html | 71 ---
kernel/rcu/tree_plugin.h | 11 +++
2 files changed, 11 insertions(+), 71 deletions(-)
diff --git
: Alan Stern
Signed-off-by: Joel Fernandes (Google)
---
tools/memory-model/Documentation/explanation.txt | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/tools/memory-model/Documentation/explanation.txt
b/tools/memory-model/Documentation/explanation.txt
index 68caa9
->prop ordering on P0 more clear.
Cc: kernel-t...@android.com
Reviewed-by: Boqun Feng
Signed-off-by: Joel Fernandes (Google)
---
.../memory-model/Documentation/explanation.txt | 17 ++---
1 file changed, 10 insertions(+), 7 deletions(-)
diff --git a/tools/memory-model/Docu
0 more clear.
Signed-off-by: Joel Fernandes (Google)
---
tools/memory-model/Documentation/explanation.txt | 16 +---
1 file changed, 9 insertions(+), 7 deletions(-)
diff --git a/tools/memory-model/Documentation/explanation.txt
b/tools/memory-model/Documentation/explanation.txt
add a warning to catch it in the
future.
[1] https://lore.kernel.org/lkml/20190717172100.261204-1-j...@joelfernandes.org/
Signed-off-by: Joel Fernandes (Google)
---
kernel/signal.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/kernel/signal.c b/kernel/signal.c
index 91b789dd6e72
, address
space changes can occur between reading the pagemap and reading the
bitmap. In virtual address indexing, the process's mmap_sem is held for
the duration of the access.
Cc: vdavydov@gmail.com
Cc: Brendan Gregg
Cc: kernel-t...@android.com
Signed-off-by: Joel Fernandes (Google
he waiting task is not notified again. A stress
test continuously doing pidfd poll and process exits uncovered this bug,
and the below patch fixes it.
To fix this, we set tsk->exit_state before calling do_notify_pidfd.
Cc: kernel-t...@android.com
Signed-off-by: Suren Baghdasaryan
Signed-off-by: Joel
Using the previous support added, use it for adding lockdep conditions
to list usage here.
Signed-off-by: Joel Fernandes (Google)
---
net/ipv4/fib_frontend.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c
index
list_for_each_entry_rcu now has support to check for RCU reader sections
as well as lock. Just use the support in it, instead of explictly
checking in the caller.
Signed-off-by: Joel Fernandes (Google)
---
kernel/workqueue.c | 10 ++
1 file changed, 2 insertions(+), 8 deletions(-)
diff
Fernandes (Google)
---
arch/x86/pci/mmconfig-shared.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/arch/x86/pci/mmconfig-shared.c b/arch/x86/pci/mmconfig-shared.c
index 7389db538c30..6fa42e9c4e6f 100644
--- a/arch/x86/pci/mmconfig-shared.c
+++ b/arch/x86/pci/mmconfig
list_for_each_entry_rcu has built-in RCU and lock checking. Make use of
it for acpi_ioremaps list traversal.
Signed-off-by: Joel Fernandes (Google)
---
drivers/acpi/osl.c | 6 --
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index
need to pass the
optional fourth argument (cond) unless they are under some non-RCU
protection and needs to make lockdep check pass.
Signed-off-by: Joel Fernandes (Google)
---
include/linux/rculist.h | 28 -
include/linux/rcupdate.h | 7 +++
kernel/rcu/Kconfig.debug
list_for_each_entry_rcu has built-in RCU and lock checking. Make use of
it in driver core.
Acked-by: Greg Kroah-Hartman
Signed-off-by: Joel Fernandes (Google)
---
drivers/base/base.h | 1 +
drivers/base/core.c | 10 ++
drivers/base/power/runtime.c | 15
This patch updates the documentation with information about
usage of lockdep with list_for_each_entry_rcu().
Signed-off-by: Joel Fernandes (Google)
---
Documentation/RCU/lockdep.txt | 15 +++
Documentation/RCU/whatisRCU.txt | 9 -
2 files changed, 19 insertions(+), 5
-off-by: Joel Fernandes (Google)
---
include/linux/rcu_sync.h | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/include/linux/rcu_sync.h b/include/linux/rcu_sync.h
index 9b83865d24f9..0027d4c8087c 100644
--- a/include/linux/rcu_sync.h
+++ b/include/linux/rcu_sync.h
@@ -31,9
wq_mutex deleted (Daniel Jordan)
Simplify rcu_read_lock_any_held() (Peter Zijlstra)
Simplified rcu-sync logic (Oleg Nesterov)
Updated documentation and rculist comments.
Added GregKH ack.
RFC->v1:
Simplify list checking macro (Rasmus Villemo
list_for_each_entry_rcu now has support to check for RCU reader sections
as well as lock. Just use the support in it, instead of explictly
checking in the caller.
Signed-off-by: Joel Fernandes (Google)
---
kernel/workqueue.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git
list_for_each_entry_rcu has built-in RCU and lock checking. Make use of
it for acpi_ioremaps list traversal.
Signed-off-by: Joel Fernandes (Google)
---
drivers/acpi/osl.c | 6 --
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index
r_wq_mutex() function which is called in for_each_wq(). This
series replaces that in favor of the built-in check.
Also in the future, we can extend these checks to list_entry_rcu() and other
list macros as well, if needed.
Joel Fernandes (Google) (6):
rcu: Add support for consolidated-RCU reader checking
list_for_each_entry_rcu has built-in RCU and lock checking. Make use of
it in driver core.
Signed-off-by: Joel Fernandes (Google)
---
drivers/base/base.h | 1 +
drivers/base/core.c | 10 ++
drivers/base/power/runtime.c | 15 ++-
3 files changed, 21
need to pass the
optional fourth argument (cond) unless they are under some non-RCU
protection and needs to make lockdep check pass.
Signed-off-by: Joel Fernandes (Google)
---
include/linux/rculist.h | 29 -
include/linux/rcupdate.h | 7 +++
kernel/rcu
Fernandes (Google)
---
arch/x86/pci/mmconfig-shared.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/arch/x86/pci/mmconfig-shared.c b/arch/x86/pci/mmconfig-shared.c
index 7389db538c30..6fa42e9c4e6f 100644
--- a/arch/x86/pci/mmconfig-shared.c
+++ b/arch/x86/pci/mmconfig
Signed-off-by: Joel Fernandes (Google)
---
net/ipv4/fib_frontend.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c
index b298255f6fdb..ef7c9f8e8682 100644
--- a/net/ipv4/fib_frontend.c
+++ b/net/ipv4/fib_frontend.c
@@ -127,7
Add the needed library support in this commit.
Signed-off-by: Joel Fernandes (Google)
---
tools/lib/bpf/bpf.c | 53
tools/lib/bpf/bpf.h | 4 +++
tools/lib/bpf/libbpf.map | 2 ++
3 files changed, 59 insertions(+)
diff --git a/tools/lib/bpf
In preparation to use raw tracepoints for BPF directly from ftrace, move
the bpf_raw_tracepoint functionality into bpf_trace.c
Signed-off-by: Joel Fernandes (Google)
---
include/linux/bpf_trace.h | 10 ++
kernel/bpf/syscall.c| 69 ++---
kernel/trace
Here we add support for testing the attach and detach of a BPF program
to a tracepoint through tracefs.
Signed-off-by: Joel Fernandes (Google)
---
.../raw_tp_writable_test_ftrace_run.c | 89 +++
1 file changed, 89 insertions(+)
create mode 100644
tools/testing
Add a new bpf file to each trace event. The following commands can be
written into it:
attach: Attaches BPF prog fd to tracepoint
detach: Detaches BPF prog fd to tracepoint
Reading the bpf file will show all the attached programs to the
tracepoint.
Signed-off-by: Joel Fernandes (Google
bpf file to /sys/kernel/debug/tracing/events/X/Y/bpf
The following commands can be written into it:
attach: Attaches BPF prog fd to tracepoint
detach: Detaches BPF prog fd to tracepoint
Reading the bpf file will show all the attached programs to the tracepoint.
Joel Fernandes (Google) (4
which fixes Python feature detection for me.
I am not sure if it is the right fix for Python since it is hardcoded
for Python version 2, but I thought it could be useful.
My system is a Debian buster release.
Cc: a...@kernel.org
Cc: jo...@redhat.com
Signed-off-by: Joel Fernandes (Google
stem_state if SYSTEM_RUNNING
is set before starting the test. The system_state approximately aligns
with when rcu_unexpedited_gp() is called and works well in practice.
I also tried late_initcall however it is still too early to be
meaningful for this case.
Signed-off-by: Joel Fernandes (Google)
---
called yet before starting the writer test. With this, the holdoff
parameter could also be dropped or reduced to speed up the test.
Signed-off-by: Joel Fernandes (Google)
---
Please consider this patch as an RFC only! This is the first time I am
running the RCU performance tests, thanks!
Question:
I ac
um.org
Reviewed-by: Andrea Parri
Signed-off-by: Joel Fernandes (Google)
---
v1->v2 is to get rid of the atomic_read().
v2->v3 replaces ATOMIC_INIT with REFCOUNT_INIT
include/linux/pid.h | 5 +++--
kernel/pid.c| 9 -
2 files changed, 7 insertions(+), 7 deletions(-)
diff --git a/
ich if
rcu_read_unlock_special::need_qs is set might be quite urgent. Make use
of this information in deciding when to do heavy-weight softirq raising
where possible.
Signed-off-by: Joel Fernandes (Google)
---
kernel/rcu/tree_plugin.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/kernel/
() which was added
during the RCU consolidation work and already does these checks.
Tested RCU config TREE03 for an hour which succeeds.
Cc: r...@vger.kernel.org
Cc: kernel-t...@android.com
Signed-off-by: Joel Fernandes (Google)
---
kernel/rcu/tree_plugin.h | 9 -
1 file changed, 9 deletions
This reverts commit a6fda6dab93c2c06ef4b8cb4b9258df6674d2438 which
causes kvm.sh to not run on my machines. The qemu-system-x86_64 command
runs but does nothing.
Signed-off-by: Joel Fernandes (Google)
---
I am Ok if we want to drop this patch but it is in my tree because
without it I can't run
cios.com
Cc: wi...@infradead.org
Cc: pet...@infradead.org
Cc: will.dea...@arm.com
Cc: paul...@linux.vnet.ibm.com
Cc: elena.reshet...@intel.com
Cc: keesc...@chromium.org
Cc: kernel-t...@android.com
Cc: kernel-harden...@lists.openwall.com
Signed-off-by: Joel Fernandes (Google)
---
Only change from v1-&g
.@redhat.com
Cc: mathieu.desnoy...@efficios.com
Cc: wi...@infradead.org
Cc: pet...@infradead.org
Cc: will.dea...@arm.com
Cc: paul...@linux.vnet.ibm.com
Cc: elena.reshet...@intel.com
Cc: keesc...@chromium.org
Cc: kernel-t...@android.com
Cc: kernel-harden...@lists.openwall.com
Signed-off-by: Joel Fe
From: Joel Fernandes
Johannes, all, could you take a look at the below backport of this fix
which I am apply for our Android 4.9 kernel? Since lruvec stats are not
present in the kernel and I did not want to backport that, I added my
own mem_cgroup_update_stat functions which should be
From: Joel Fernandes
Johannes, all, could you take a look at the below backport of this fix
which I am apply for our Android 4.9 kernel? Since lruvec stats are not
present in the kernel and I did not want to backport that, I added my
own mem_cgroup_update_stat functions which should be
list_for_each_entry_rcu now has support to check for RCU reader sections
as well as lock. Just use the support in it, instead of explictly
checking in the caller.
Signed-off-by: Joel Fernandes (Google)
---
kernel/workqueue.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git
list_for_each_entry_rcu has built-in RCU and lock checking. Make use of
it in driver core.
Signed-off-by: Joel Fernandes (Google)
---
drivers/base/base.h | 1 +
drivers/base/core.c | 10 ++
drivers/base/power/runtime.c | 15 ++-
3 files changed, 21
e code has a
assert_rcu_or_wq_mutex() function which is called in for_each_wq(). This
series replaces that in favor of the built-in one.
Also in the future, we can extend these checks to list_entry_rcu() and other
list macros as well.
Joel Fernandes (Google) (6):
rcu: Add support for consolidated-RCU reader checking
Fernandes (Google)
---
arch/x86/pci/mmconfig-shared.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/arch/x86/pci/mmconfig-shared.c b/arch/x86/pci/mmconfig-shared.c
index 7389db538c30..6fa42e9c4e6f 100644
--- a/arch/x86/pci/mmconfig-shared.c
+++ b/arch/x86/pci/mmconfig
need to pass the
optional fourth argument (cond) unless they are under some non-RCU
protection and needs to make lockdep check pass.
Signed-off-by: Joel Fernandes (Google)
---
include/linux/rculist.h | 40
include/linux/rcupdate.h | 7 +++
kernel/rcu
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