On 2024/2/28 00:29, Dave Jiang wrote:
>
>
> On 2/24/24 6:47 AM, chengming.z...@linux.dev wrote:
>> From: Chengming Zhou
>>
>> The SLAB_MEM_SPREAD flag is already a no-op as of 6.8-rc1, remove
>> its usage so we can delete it from slab. No functional change.
&
From: Chengming Zhou
The SLAB_MEM_SPREAD flag is already a no-op as of 6.8-rc1, remove
its usage so we can delete it from slab. No functional change.
Signed-off-by: Chengming Zhou
---
fs/tracefs/inode.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/fs/tracefs/inode.c b/fs/tracefs/inode.c
From: Chengming Zhou
The SLAB_MEM_SPREAD flag is already a no-op as of 6.8-rc1, remove
its usage so we can delete it from slab. No functional change.
Signed-off-by: Chengming Zhou
---
drivers/dax/super.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/dax/super.c b
On 2023/10/17 21:56, wuqiang.matt wrote:
> objpool is a scalable implementation of high performance queue for
> object allocation and reclamation, such as kretprobe instances.
>
> With leveraging percpu ring-array to mitigate hot spots of memory
> contention, it delivers near-linear scalability fo
these counters maintained in psi subsystem,
so this patch sum them up and export in the cgroup.stat interface.
Signed-off-by: Chengming Zhou
---
Documentation/admin-guide/cgroup-v2.rst | 9 +++
include/linux/psi.h | 1 +
kernel/cgroup/cgroup.c
The following commit has been merged into the sched/core branch of tip:
Commit-ID: 4117cebf1a9fcbf35b9aabf0e37b6c5eea296798
Gitweb:
https://git.kernel.org/tip/4117cebf1a9fcbf35b9aabf0e37b6c5eea296798
Author:Chengming Zhou
AuthorDate:Wed, 03 Mar 2021 11:46:59 +08:00
The following commit has been merged into the sched/core branch of tip:
Commit-ID: e7fcd762282332f765af2035a9568fb126fa3c01
Gitweb:
https://git.kernel.org/tip/e7fcd762282332f765af2035a9568fb126fa3c01
Author:Chengming Zhou
AuthorDate:Wed, 03 Mar 2021 11:46:56 +08:00
The following commit has been merged into the sched/core branch of tip:
Commit-ID: 7fae6c8171d20ac55402930ee8ae760cf85dff7b
Gitweb:
https://git.kernel.org/tip/7fae6c8171d20ac55402930ee8ae760cf85dff7b
Author:Chengming Zhou
AuthorDate:Wed, 03 Mar 2021 11:46:57 +08:00
The following commit has been merged into the sched/core branch of tip:
Commit-ID: e6560d58334ca463061ade733674abc8dd0df9bd
Gitweb:
https://git.kernel.org/tip/e6560d58334ca463061ade733674abc8dd0df9bd
Author:Chengming Zhou
AuthorDate:Wed, 03 Mar 2021 11:46:59 +08:00
The following commit has been merged into the sched/core branch of tip:
Commit-ID: f3f7feec57b9141dfed9825874d0191b1ac18ad2
Gitweb:
https://git.kernel.org/tip/f3f7feec57b9141dfed9825874d0191b1ac18ad2
Author:Chengming Zhou
AuthorDate:Wed, 03 Mar 2021 11:46:57 +08:00
The following commit has been merged into the sched/core branch of tip:
Commit-ID: 311b293811a31929c72c790eff48cf767561589f
Gitweb:
https://git.kernel.org/tip/311b293811a31929c72c790eff48cf767561589f
Author:Chengming Zhou
AuthorDate:Wed, 03 Mar 2021 11:46:56 +08:00
在 2021/3/4 上午12:05, Peter Zijlstra 写道:
> On Wed, Mar 03, 2021 at 04:32:18PM +0100, Peter Zijlstra wrote:
>
>> Yes, I can do that. Thanks!
> Please double check the patches as found here:
>
>
> https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git/log/?h=sched/core
>
> I've manually e
From: Johannes Weiner
Move the unlikely branches out of line. This eliminates undesirable
jumps during wakeup and sleeps for workloads that aren't under any
sort of resource pressure.
Signed-off-by: Johannes Weiner
---
kernel/sched/psi.c | 14 +++---
1 file changed, 7 insertions(+), 7
branches
out of line to eliminate undesirable jumps during wakeup and sleeps.
Patch 4 optimize the voluntary sleep switch by remove one call of
psi_group_change() for every common cgroup ancestor of the two tasks.
Chengming Zhou (3):
psi: Add PSI_CPU_FULL state
psi: Use ONCPU state tracking
)) # all ancestors
psi_group_change(prev, .clear=common?TSK_RUNNING:TSK_RUNNING|TSK_ONCPU)
When a voluntary sleep switches to another task, we remove one call of
psi_group_change() for every common cgroup ancestor of the two tasks.
Signed-off-by: Muchun Song
Signed-off-by: Chengming Zhou
---
Updat
nting out the psi_task_switch()
optimization things and the clearer changelog.
Signed-off-by: Muchun Song
Signed-off-by: Chengming Zhou
---
Updates since v1:
- Fold changes from Johannes that compare task psi_flags instead of
in_memstall in the psi_task_switch() optimization and move it out
o
Song
Signed-off-by: Muchun Song
Signed-off-by: Chengming Zhou
Acked-by: Johannes Weiner
---
include/linux/psi_types.h | 3 ++-
kernel/sched/psi.c| 14 +++---
2 files changed, 13 insertions(+), 4 deletions(-)
diff --git a/include/linux/psi_types.h b/include/linux/psi_types.h
code from Johannes.
Signed-off-by: Muchun Song
Signed-off-by: Chengming Zhou
---
kernel/sched/psi.c | 35 +--
kernel/sched/stats.h | 28
2 files changed, 37 insertions(+), 26 deletions(-)
diff --git a/kernel/sched/psi.c b/kerne
Hello Johannes,
在 2021/2/17 上午4:00, Johannes Weiner 写道:
> Hello Chengming,
>
> This patch looks useful to me. A couple of comments below:
>
> On Tue, Feb 09, 2021 at 03:14:13PM +0800, Chengming Zhou wrote:
>> The commit 36b238d57172 ("psi: Optimize switching tasks insid
from Johannes
too, and the detailed bench results can be seen from here:
https://lore.kernel.org/patchwork/patch/1378653/#1577607
Signed-off-by: Muchun Song
Signed-off-by: Chengming Zhou
---
include/linux/psi.h | 1 -
kernel/sched/core.c | 1 -
kernel/sched/psi.c
Hello Johannes,
在 2021/2/11 上午4:37, Johannes Weiner 写道:
> On Wed, Feb 10, 2021 at 12:06:05PM +0800, Chengming Zhou wrote:
>> Move the reclaim detection from the timer tick to the task state
>> tracking machinery using the recently added ONCPU state. And we
>> also add m
psi_task_switch()
optimization things and the clearer changelog.
Signed-off-by: Muchun Song
Signed-off-by: Chengming Zhou
---
include/linux/psi.h | 1 -
kernel/sched/core.c | 1 -
kernel/sched/psi.c | 52
kernel/sched/stats.h | 9 -
4
Hello Johannes,
在 2021/2/9 下午11:48, Johannes Weiner 写道:
> Hello Chengming,
>
> On Tue, Feb 09, 2021 at 03:10:33PM +0800, Chengming Zhou wrote:
>> When the current task in a cgroup is in_memstall, the corresponding groupc
>> on that cpu is in PSI_MEM_FULL state, so we can e
t and prev task in sleep case, that can save many psi_group_change
especially when most activity comes from one leaf cgroup.
Signed-off-by: Muchun Song
Signed-off-by: Chengming Zhou
---
kernel/sched/psi.c | 27 +--
kernel/sched/stats.h | 17 +++--
2 fi
When the current task in a cgroup is in_memstall, the corresponding groupc
on that cpu is in PSI_MEM_FULL state, so we can exploit that to remove the
redundant psi_task_tick from scheduler_tick to save this periodic cost.
Signed-off-by: Muchun Song
Signed-off-by: Chengming Zhou
---
include
在 2021/2/9 上午12:45, Johannes Weiner 写道:
> On Sun, Feb 07, 2021 at 07:56:42PM +0800, Chengming Zhou wrote:
>> From: zhouchengming
>>
>> When the current task in a cgroup is in_memstall, the corresponding psi_group
>> is in PSI_MEM_FULL state
> This is correct.
>
Song
Signed-off-by: Muchun Song
Signed-off-by: Chengming Zhou
Acked-by: Johannes Weiner
---
include/linux/psi_types.h | 3 ++-
kernel/sched/psi.c| 14 +++---
2 files changed, 13 insertions(+), 4 deletions(-)
diff --git a/include/linux/psi_types.h b/include/linux/psi_types.h
在 2021/2/9 上午2:18, Johannes Weiner 写道:
> On Sun, Feb 07, 2021 at 03:24:02PM +0800, Chengming Zhou wrote:
>> The FULL state doesn't exist for the CPU resource at the system level,
>> but exist at the cgroup level, means all non-idle tasks in a cgroup are
>> delayed on t
From: zhouchengming
When the current task in a cgroup is in_memstall, the corresponding psi_group
is in PSI_MEM_FULL state, so we can remove the redundant psi_task_tick
from scheduler_tick to save this periodic cost.
Signed-off-by: Chengming Zhou
---
include/linux/psi.h | 1 -
kernel/sched
The FULL state doesn't exist for the CPU resource at the system level,
but exist at the cgroup level, means all non-idle tasks in a cgroup are
delayed on the CPU resource which used by others outside of the cgroup.
Co-developed-by: Muchun Song
Signed-off-by: Muchun Song
Signed-off-by: Chen
From: zhouchengming
When I run a simple "perf bench sched pipe" test in a cgroup on my
machine, the output of "watch -d -n 1 cpu.pressure" of this cgroup
will report some avg10 10%-20%.
It's strange because there is not any other process in the cgroup.
Then I found that cpu contention/wait percen
在 2020/9/28 下午5:01, Peter Zijlstra 写道:
> On Mon, Sep 28, 2020 at 04:54:53PM +0800, Chengming Zhou wrote:
>> 在 2020/9/28 下午3:32, Peter Zijlstra 写道:
>>> On Mon, Sep 28, 2020 at 12:11:30AM +0800, Chengming Zhou wrote:
>>>> The WARN_ON/WARN_ON_ONCE with rq lock
在 2020/9/28 下午3:32, Peter Zijlstra 写道:
> On Mon, Sep 28, 2020 at 12:11:30AM +0800, Chengming Zhou wrote:
>> The WARN_ON/WARN_ON_ONCE with rq lock held in __schedule() should be
>> deferred by marking the PRINTK_DEFERRED_CONTEXT_MASK, or will cause
>> deadlock on rq lock in
dlock when warn condition met. If we can mark the
printk_deferred area when rq lock held using pintk_deferred_{enter, exit},
all console output in that area will be deferred.
Signed-off-by: Chengming Zhou
Signed-off-by: MuChun Song
---
include/linux/printk.h | 8
kernel/p
The WARN_ON/WARN_ON_ONCE with rq lock held in __schedule() should be
deferred by marking the PRINTK_DEFERRED_CONTEXT_MASK, or will cause
deadlock on rq lock in the printk path.
Signed-off-by: Chengming Zhou
Signed-off-by: Muchun Song
---
kernel/sched/core.c | 2 ++
1 file changed, 2 insertions
在 2020/9/21 下午10:50, Tejun Heo 写道:
> Hello,
>
> On Tue, Sep 15, 2020 at 11:53:49PM +0800, Chengming Zhou wrote:
>> In the cgroup v1, we can use netlink interface to get cgroupstats for
>> a cgroup. But it has been excluded from cgroup v2 interface intentionally
>>
add
these cgroupstats numbers to the cgroup.stat file, and change the
admin-guide doc accordingly.
Reported-by: Daowen Luo
Tested-by: Chengming Zhou
Signed-off-by: Muchun Song
Signed-off-by: Chengming Zhou
---
Documentation/admin-guide/cgroup-v2.rst | 15 ++
kernel/cgrou
在 2020/9/10 下午10:32, Tejun Heo 写道:
> On Thu, Sep 10, 2020 at 01:52:07PM +0800, Chengming Zhou wrote:
>> We found cgroupstats_build would return -EINVAL when using netlink
>> CGROUPSTATS_CMD_GET interface to get stats on cgroup v2. Fix it by
>> supporting cgroup v
: Chengming Zhou
Signed-off-by: Chengming Zhou
---
kernel/cgroup/cgroup-internal.h | 1 +
kernel/cgroup/cgroup-v1.c | 5 +++--
kernel/cgroup/cgroup.c | 3 +--
3 files changed, 5 insertions(+), 4 deletions(-)
diff --git a/kernel/cgroup/cgroup-internal.h b/kernel/cgroup/cgroup-internal.h
The last else branch of current code may have not io waited in iocg,
in which case we should not inc nr_shortages, or the device vrate
will speed up even this iocg is not shortage of vtime.
Signed-off-by: Chengming Zhou
---
block/blk-iocost.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion
在 2020/7/29 上午1:26, Steven Rostedt 写道:
> On Wed, 29 Jul 2020 00:59:33 +0800
> Chengming Zhou wrote:
>
>
>>> i.e.
>>>
>>> # echo some_module_function > set_ftrace_filter
>>> # rmmod module_with_that_function
>>> # insmo
iocg usage_idx is the latest usage index, we should start from the
oldest usage index to show the consecutive NR_USAGE_SLOTS usages.
Signed-off-by: Chengming Zhou
---
tools/cgroup/iocost_monitor.py | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/cgroup
We shouldn't skip iocg when its abs_vdebt is not zero.
Fixes: 0b80f9866e6b ("iocost: protect iocg->abs_vdebt with
iocg->waitq.lock")
Signed-off-by: Chengming Zhou
---
block/blk-iocost.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/block/blk-iocost.c
, in which case
we can use trampoline as an optimization.
Signed-off-by: Chengming Zhou
Signed-off-by: Muchun Song
---
kernel/trace/ftrace.c | 8
1 file changed, 8 insertions(+)
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index a3d141f53c9e..8c1d9e3daa67 100644
--- a
has FTRACE_OPS_FL_SAVE_REGS to be called
with pt_regs set to NULL.
So setup correct FTRACE_FL_REGS flags for rec when we call
referenced_filters to find ftrace_ops references it.
Signed-off-by: Chengming Zhou
Signed-off-by: Muchun Song
---
kernel/trace/ftrace.c | 11 +++
1 file changed
在 2020/7/28 下午9:02, Steven Rostedt 写道:
> On Tue, 28 Jul 2020 18:27:20 +0800
> Chengming Zhou wrote:
>
>> When module loaded and enabled, we will use __ftrace_replace_code
>> for module if any ftrace_ops referenced it found. But we will get
>> wrong ft
在 2020/7/28 下午8:53, Steven Rostedt 写道:
On Tue, 28 Jul 2020 18:27:19 +0800
Chengming Zhou wrote:
We should clear module from hash of all ops on ftrace_ops_list when
module going, or the ops including these modules will be matched
wrongly by new module loaded later.
This is really up to the
We should clear module from hash of all ops on ftrace_ops_list when
module going, or the ops including these modules will be matched
wrongly by new module loaded later.
Signed-off-by: Chengming Zhou
Signed-off-by: Muchun Song
---
kernel/trace/ftrace.c | 22 --
1 file
ilters to find
ftrace_ops references it.
Signed-off-by: Chengming Zhou
Signed-off-by: Muchun Song
---
kernel/trace/ftrace.c | 16 +---
1 file changed, 13 insertions(+), 3 deletions(-)
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index fca01a168ae5..00087dea0174 100644
49 matches
Mail list logo
