On Tue, Nov 26, 2024 at 11:25:07AM +0100, Roberto Sassu wrote:
> On Mon, 2024-11-25 at 15:53 -0800, Luis Chamberlain wrote:
>
> Firmware, eBPF programs and so on are supposed
Keyword: "supposed".
> As far as the LSM infrastructure is concerned, I'm not adding new LSM
> hooks, nor extending/modi
Hi Mauro and Hans,
On Mon, Nov 25, 2024 at 02:28:58PM +0100, Mauro Carvalho Chehab wrote:
> As the media subsystem will experiment with a multi-committers model,
> update the Maintainer's entry profile to the new rules, and add a file
> documenting the process to become a committer and to maintain
On Tue, Nov 26, 2024 at 06:57:19PM -0800, Yuanchu Xie wrote:
> This patch series provides workingset reporting of user pages in
> lruvecs, of which coldness can be tracked by accessed bits and fd
> references. However, the concept of workingset applies generically to
> all types of memory, which co
On Tue, Nov 26, 2024 at 06:57:20PM -0800, Yuanchu Xie wrote:
> diff --git a/mm/internal.h b/mm/internal.h
> index 64c2eb0b160e..bbd3c1501bac 100644
> --- a/mm/internal.h
> +++ b/mm/internal.h
> @@ -470,9 +470,14 @@ extern unsigned long highest_memmap_pfn;
> /*
> * in mm/vmscan.c:
> */
> +struc
Hierarchically aggregate all memcgs' MGLRU generations and their
page counts into working set page age histograms.
The histograms break down the system's workingset per-node,
per-anon/file.
The sysfs interfaces are as follows:
/sys/devices/system/node/nodeX/workingset_report/page_age
A per
The refresh interval is a rate limiting factor to workingset page age
histogram reads. When a workingset report is generated, the oldest
timestamp of all the lruvecs is stored as the timestamp of the report.
The same report will be read until the report expires beyond the refresh
interval, at which
When a node reaches its low watermarks and wakes up kswapd, notify all
userspace programs waiting on the workingset page age histogram of the
memory pressure, so a userspace agent can read the workingset report in
time and make policy decisions, such as logging, oom-killing, or
migration.
Sysfs in
A basic test that verifies the working set size of a simple memory
accessor. It should work with or without the aging thread.
When running tests with run_vmtests.sh, file workingset report testing
requires an environment variable WORKINGSET_REPORT_TEST_FILE_PATH to
store a temporary file, which is
Break down the system-wide workingset report into per-memcg reports,
which aggregages its children hierarchically.
The per-node workingset reporting histograms and refresh/report
threshold files are presented as memcg files, showing a report
containing all the nodes.
The per-node page age interva
For reliable and timely aging on memcgs, one has to read the page age
histograms on time. A kernel thread makes it easier by aging memcgs with
valid refresh_interval when they can be refreshed, and also reduces the
latency of any userspace consumers of the page age histogram.
The kerne aging threa
Ballooning is a way to dynamically size a VM, and it requires guest
collaboration. The amount to balloon without adversely affecting guest
performance is hard to compute without clear metrics from the guest.
Workingset reporting can provide guidance to the host to allow better
collaborative balloo
Add workingset reporting documentation for better discoverability of
its sysfs and memcg interfaces. Also document the required kernel
config to enable workingset reporting.
Signed-off-by: Yuanchu Xie
---
Documentation/admin-guide/mm/index.rst| 1 +
.../admin-guide/mm/workingset_report
Add workingset reporting documentation for better discoverability of
its memcg interfaces. Point the memcg documentation to
Documentation/admin-guide/mm/workingset_report.rst for more details.
Signed-off-by: Yuanchu Xie
---
Documentation/admin-guide/cgroup-v2.rst | 35 +
This patch series provides workingset reporting of user pages in
lruvecs, of which coldness can be tracked by accessed bits and fd
references. However, the concept of workingset applies generically to
all types of memory, which could be kernel slab caches, discardable
userspace caches (databases),
On Tue, 2024-11-26 at 00:13 +, Eric Snowberg wrote:
>
> > On Nov 19, 2024, at 3:49 AM, Roberto Sassu
> > wrote:
> >
> > From: Roberto Sassu
> >
> > The Integrity Digest Cache can also help IMA for appraisal. IMA can simply
> > lookup the calculated digest of an accessed file in the list o
On Mon, 2024-11-25 at 15:53 -0800, Luis Chamberlain wrote:
> On Tue, Nov 19, 2024 at 11:49:14AM +0100, Roberto Sassu wrote:
> > From: Roberto Sassu
> > Introduce load_parser() to load a kernel module containing a
> > parser for the requested digest list format (compressed kernel modules are
> > su
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