From: SeongJae Park
DAMON's main idea is not limited to virtual address space. To prepare
for further expansion of the support for other address spaces including
physical memory, this commit modifies one of its core struct, 'struct
damon_region' to use virtual memory independent address space
On Tue, 9 Jun 2020 14:56:07 +0200 Greg KH wrote:
> On Tue, Jun 09, 2020 at 02:25:49PM +0200, SeongJae Park wrote:
> > From: SeongJae Park
> >
> > This commit recommends the patches to replace 'blacklist' and
> > 'whitelist' with the 'blocklist' and 'allowlist', beca
From: SeongJae Park
This commit recommends the patches to replace 'blacklist' and
'whitelist' with the 'blocklist' and 'allowlist', because the new
suggestions are incontrovertible, doesn't make people hurt, and more
self-explanatory.
Signed-off-by: SeongJae Park
---
scripts/spelling.txt | 2
On Tue, 9 Jun 2020 14:18:43 +0200 SeongJae Park wrote:
> From: SeongJae Park
>
> This commit recommends the patches to replace 'blacklist' and
> 'whitelist' with the 'blocklist' and 'allowlist', because the new
> suggestions are incontrovertible, doesn't make people hurt,
From: SeongJae Park
This commit recommends the patches to replace 'blacklist' and
'whitelist' with the 'blocklist' and 'allowlist', because the new
suggestions are incontrovertible, doesn't make people hurt, and more
self-explanatory.
Signed-off-by: SeongJae Park
cr https://code.amazon.com
On Tue, 9 Jun 2020 10:47:45 +0200 David Hildenbrand wrote:
> On 09.06.20 08:53, SeongJae Park wrote:
> > From: SeongJae Park
> >
> > In many cases, users might use DAMON for simple data access aware
> > memory management optimizations such as applying an operation sc
From: SeongJae Park
This commit documents DAMON-based operation schemes in the DAMON
document.
Signed-off-by: SeongJae Park
---
Documentation/admin-guide/mm/damon/guide.rst | 35 +
Documentation/admin-guide/mm/damon/plans.rst | 26 +---
Documentation/admin-guide/mm/damon/usage.rst | 127
From: SeongJae Park
This commit adds simple selftets for 'schemes' debugfs file of DAMON.
Signed-off-by: SeongJae Park
---
.../testing/selftests/damon/debugfs_attrs.sh | 29 +++
1 file changed, 29 insertions(+)
diff --git a/tools/testing/selftests/damon/debugfs_attrs.sh
b
From: SeongJae Park
This commit implements 'schemes' subcommand of the damon userspace tool.
It can be used to describe and apply the data access monitoring-based
operation schemes in more human friendly fashion.
Signed-off-by: SeongJae Park
---
tools/damon/_convert_damos.py | 128
From: SeongJae Park
This commit implements a debugfs interface for the data access
monitoring oriented memory management schemes. It is supposed to be
used by administrators and/or privileged user space programs. Users can
read and update the rules using ``/damon/schemes`` file. The
format
From: SeongJae Park
In many cases, users might use DAMON for simple data access aware
memory management optimizations such as applying an operation scheme to
a memory region of a specific size having a specific access frequency
for a specific time. For example, "page out a memory region l
From: SeongJae Park
To tune the DAMON-based operation schemes, knowing how many and how
large regions are affected by each of the schemes will be helful. Those
stats could be used for not only the tuning, but also monitoring of the
working set size and the number of regions, if the scheme does
From: SeongJae Park
DAMON[1] can be used as a primitive for data access awared memory management
optimizations. For that, users who want such optimizations should run DAMON,
read the monitoring results, analyze it, plan a new memory management scheme,
and apply the new scheme by themselves
From: SeongJae Park
This commit exports 'do_madvise()' to external GPL modules, so that
other modules including DAMON could use the function.
Signed-off-by: SeongJae Park
---
mm/madvise.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/mm/madvise.c b/mm/madvise.c
index 1ad7522567d4
From: SeongJae Park
DAMON can be used as a primitive for data access pattern aware memory
management optimizations. However, users who want such optimizations
should run DAMON, read the monitoring results, analyze it, plan a new
memory management scheme, and apply the new scheme by themselves
So if no further comments are given, in the
next spin, I will keep this separate, but will mention exactly what future
commit needs this change, so that it can be easily squashed later, if
necessary.
Thanks,
SeongJae Park
On Mon, 8 Jun 2020 13:53:23 +0200 David Hildenbrand wrote:
> On 08.06.20 13:40, SeongJae Park wrote:
> > From: SeongJae Park
> >
> > This commit exports 'lookup_page_ext()' to GPL modules. This will be
> > used by DAMON.
> >
> > Signed-off-by: SeongJae
From: SeongJae Park
This commit adds a simple user space tests for DAMON. The tests are
using kselftest framework.
Signed-off-by: SeongJae Park
---
tools/testing/selftests/damon/Makefile| 7 +
.../selftests/damon/_chk_dependency.sh| 28
tools/testing/selftests/damon
From: SeongJae Park
This commit updates MAINTAINERS file for DAMON related files.
Signed-off-by: SeongJae Park
---
MAINTAINERS | 12
1 file changed, 12 insertions(+)
diff --git a/MAINTAINERS b/MAINTAINERS
index 50659d76976b..2396a9098715 100644
--- a/MAINTAINERS
+++ b
From: SeongJae Park
This commit adds kunit based unit tests for DAMON.
Signed-off-by: SeongJae Park
Reviewed-by: Brendan Higgins
---
mm/Kconfig | 11 +
mm/damon-test.h | 635
mm/damon.c | 6 +
3 files changed, 652 insertions
From: SeongJae Park
This commit adds a shallow wrapper python script, ``/tools/damon/damo``
that provides more convenient interface. Note that it is only aimed to
be used for minimal reference of the DAMON's debugfs interfaces and for
debugging of the DAMON itself.
Signed-off-by: SeongJae Park
From: SeongJae Park
This commit adds a tracepoint for DAMON. It traces the monitoring
results of each region for each aggregation interval. Using this, DAMON
will be easily integrated with any tracepoints supporting tools such as
perf.
Signed-off-by: SeongJae Park
Reviewed-by: Leonard
From: SeongJae Park
This commit adds a debugfs interface for DAMON.
DAMON exports four files, ``attrs``, ``pids``, ``record``, and
``monitor_on`` under its debugfs directory, ``/damon/``.
Attributes
--
Users can read and write the ``sampling interval``, ``aggregation
interval
From: SeongJae Park
This commit implements the recording feature of DAMON. If this feature
is enabled, DAMON writes the monitored access patterns in its binary
format into a file which specified by the user. This is already able to
be implemented by each user using the callbacks. However
From: SeongJae Park
This commit implements callbacks for DAMON. Using this, DAMON users can
install their callbacks for each step of the access monitoring so that
they can do something interesting with the monitored access patterns
online. For example, callbacks can report the monitored
From: SeongJae Park
Only a number of parts in the virtual address space of the processes is
mapped to physical memory and accessed. Thus, tracking the unmapped
address regions is just wasteful. However, tracking every memory
mapping change might incur an overhead. For the reason, DAMON
From: SeongJae Park
At the beginning of the monitoring, DAMON constructs the initial regions
by evenly splitting the memory mapped address space of the process into
the user-specified minimal number of regions. In this initial state,
the assumption of the regions (pages in same region have
From: SeongJae Park
This commit implements DAMON's basic access check and region based
sampling mechanisms. This change would seems make no sense, mainly
because it is only a part of the DAMON's logics. Following two commits
will make more sense.
Basic Access Check
--
DAMON
From: SeongJae Park
This commit introduces a kernel module named DAMON. Note that this
commit is implementing only the stub for the module load/unload, basic
data structures, and simple manipulation functions of the structures to
keep the size of commit small. The core mechanisms of DAMON
From: SeongJae Park
This commit exports 'lookup_page_ext()' to GPL modules. This will be
used by DAMON.
Signed-off-by: SeongJae Park
Reviewed-by: Leonard Foerster
---
mm/page_ext.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/mm/page_ext.c b/mm/page_ext.c
index a3616f7a0e9e
From: SeongJae Park
Introduction
DAMON is a data access monitoring framework subsystem for the Linux kernel.
The core mechanisms of DAMON called 'region based sampling' and 'adaptive
regions adjustment' (refer to 'mechanisms.rst' in the 11th patch of this
patchset for the detail
Translate this commit to Korean:
39323c64b8a9 ("smp_mb__{before,after}_atomic(): update Documentation")
Signed-off-by: SeongJae Park
Reviewed-by: Yunjae Lee
---
.../translations/ko_KR/memory-barriers.txt| 15 +--
1 file changed, 9 insertions(+), 6 deletion
From: SeongJae Park
This commit adds typos I found from another works.
Signed-off-by: SeongJae Park
---
scripts/spelling.txt | 9 +
1 file changed, 9 insertions(+)
diff --git a/scripts/spelling.txt b/scripts/spelling.txt
index d9cd24cf0d40..c45e9afaab2d 100644
--- a/scripts
From: SeongJae Park
This patchset fixes a potential problem in idle page tracking and adds
more typos in the scripts/spelling.txt. The problem and the typos were
found during my DAMON[1] work.
This patchset is based on next/akpm.
[1] https://lore.kernel.org/linux-mm/20200602130125.20467-1-sjp
From: SeongJae Park
'Idle page tracking' users can pass random pfn that might be mapped to
an offline page. To avoid accessing such pages, this commit modifies
the 'page_idle_get_page()' to use 'pfn_to_online_page()' instead of
'pfn_valid()' and 'pfn_to_page()' combination, so that the pfn
On Thu, 4 Jun 2020 17:39:49 +0200 David Hildenbrand wrote:
> On 04.06.20 17:23, SeongJae Park wrote:
> > On Thu, 4 Jun 2020 16:58:13 +0200 David Hildenbrand
> > wrote:
> >
> >> On 04.06.20 09:26, SeongJae Park wrote:
> >>> On Wed, 3 Jun 2020 18:0
On Thu, 4 Jun 2020 16:58:13 +0200 David Hildenbrand wrote:
> On 04.06.20 09:26, SeongJae Park wrote:
> > On Wed, 3 Jun 2020 18:09:21 +0200 David Hildenbrand
> > wrote:
> >
> >> On 03.06.20 16:11, SeongJae Park wrote:
> >>> From: SeongJae Park
&
On Tue, 26 May 2020 09:56:58 +0200 SeongJae Park wrote:
> From: SeongJae Park
>
> This commit implements a debugfs interface for the data access
> monitoring oriented memory management schemes. It is supposed to be
> used by administrators and/or privileged user space progr
On Wed, 3 Jun 2020 18:09:21 +0200 David Hildenbrand wrote:
> On 03.06.20 16:11, SeongJae Park wrote:
> > From: SeongJae Park
> >
> > This commit implements the four callbacks (->init_target_regions,
> > ->update_target_regions, ->prepare_access_check, and
From: SeongJae Park
This commit makes the debugfs interface to support the physical memory
monitoring, in addition to the virtual memory monitoring.
Users can do the physical memory monitoring by writing a special
keyword, 'paddr\n' to the 'pids' debugfs file. Then, DAMON will check
From: SeongJae Park
This commit adds description for the physical memory monitoring usage in
the DAMON document.
Signed-off-by: SeongJae Park
---
Documentation/admin-guide/mm/damon/usage.rst | 42 ++--
1 file changed, 29 insertions(+), 13 deletions(-)
diff --git
From: SeongJae Park
This commit implements the four callbacks (->init_target_regions,
->update_target_regions, ->prepare_access_check, and ->check_accesses)
for the basic access monitoring of the physical memory address space.
By setting the callback pointers to point those, user
From: SeongJae Park
DAMON assumes the target region is in virtual address space and
therefore uses PTE Accessed bit checking for access checking. However,
as some CPU provides H/W based memory access check features that usually
more accurate and light-weight than PTE Accessed bit checking, some
From: SeongJae Park
This commit documents the 'initial_regions' feature.
Signed-off-by: SeongJae Park
---
Documentation/admin-guide/mm/damon/usage.rst | 34
1 file changed, 34 insertions(+)
diff --git a/Documentation/admin-guide/mm/damon/usage.rst
b/Documentation/admin
From: SeongJae Park
This commit allows DAMON users to configure their own monitoring target
regions initializer / updater. Using this, users can confine the
monitoring address spaces as they want. For example, users can track
only stack, heap, shared memory area, or specific file-backed area
From: SeongJae Park
There are unnecessarily duplicated code in DAMON, that can be eliminated
by using the new struct, 'damon_addr_range'. This commit cleans up the
DAMON code in the way.
Signed-off-by: SeongJae Park
---
mm/damon-test.h | 36 ++--
mm/damon.c
From: SeongJae Park
Some users would want to monitor only a part of the entire virtual
memory address space. The '->init_target_regions' callback is therefore
provided, but only programming interface can use it.
For the reason, this commit introduces a new debugfs file,
'init_region'. Us
From: SeongJae Park
Currently, DAMON[1] supports only virtual memory address spaces because it
utilizes PTE Accessed bits as its low-level access check primitive and ``struct
vma`` as a way to address the monitoring target regions. However, the core
idea of DAMON, which makes it able to provide
From: SeongJae Park
DAMON's main idea is not limited to virtual address space. To prepare
for further expansion of the support for other address spaces including
physical memory, this commit modifies one of its core struct, 'struct
damon_region' to use virtual memory independent address space
On Tue, 2 Jun 2020 13:28:03 -0700 Brendan Higgins
wrote:
> On Tue, Jun 2, 2020 at 6:16 AM SeongJae Park wrote:
> >
> > From: SeongJae Park
> >
> > This commit adds another unit test case for the recording setup.
> >
> > Signed-off-by: SeongJae Park
>
From: SeongJae Park
This commit documents DAMON-based operation schemes in the DAMON
document.
Signed-off-by: SeongJae Park
---
Documentation/admin-guide/mm/damon/guide.rst | 35 +
Documentation/admin-guide/mm/damon/usage.rst | 127 +--
2 files changed, 152 insertions
From: SeongJae Park
This commit implements 'schemes' subcommand of the damon userspace tool.
It can be used to describe and apply the data access monitoring-based
operation schemes in more human friendly fashion.
Signed-off-by: SeongJae Park
---
tools/damon/_convert_damos.py | 128
From: SeongJae Park
This commit adds simple selftets for 'schemes' debugfs file of DAMON.
Signed-off-by: SeongJae Park
---
.../testing/selftests/damon/debugfs_attrs.sh | 29 +++
1 file changed, 29 insertions(+)
diff --git a/tools/testing/selftests/damon/debugfs_attrs.sh
b
From: SeongJae Park
To tune the DAMON-based operation schemes, knowing how many and how
large regions are affected by each of the schemes will be helful. Those
stats could be used for not only the tuning, but also monitoring of the
working set size and the number of regions, if the scheme does
From: SeongJae Park
In many cases, users might use DAMON for simple data access aware
memory management optimizations such as applying an operation scheme to
a memory region of a specific size having a specific access frequency
for a specific time. For example, "page out a memory region l
From: SeongJae Park
This commit implements a debugfs interface for the data access
monitoring oriented memory management schemes. It is supposed to be
used by administrators and/or privileged user space programs. Users can
read and update the rules using ``/damon/schemes`` file. The
format
From: SeongJae Park
DAMON can be used as a primitive for data access pattern aware memory
management optimizations. However, users who want such optimizations
should run DAMON, read the monitoring results, analyze it, plan a new
memory management scheme, and apply the new scheme by themselves
From: SeongJae Park
This commit exports 'do_madvise()' to external GPL modules, so that
other modules including DAMON could use the function.
Signed-off-by: SeongJae Park
---
mm/madvise.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/mm/madvise.c b/mm/madvise.c
index 1ad7522567d4
From: SeongJae Park
DAMON[1] can be used as a primitive for data access awared memory management
optimizations. For that, users who want such optimizations should run DAMON,
read the monitoring results, analyze it, plan a new memory management scheme,
and apply the new scheme by themselves
On Tue, 2 Jun 2020 11:35:36 -0400 Steven Rostedt wrote:
> On Tue, 2 Jun 2020 15:12:49 +0200
> SeongJae Park wrote:
>
> > From: SeongJae Park
> >
> > This commit adds a tracepoint for DAMON. It traces the monitoring
> > results of each region for each aggrega
From: SeongJae Park
This commit updates MAINTAINERS file for DAMON related files.
Signed-off-by: SeongJae Park
---
MAINTAINERS | 12
1 file changed, 12 insertions(+)
diff --git a/MAINTAINERS b/MAINTAINERS
index 50659d76976b..2396a9098715 100644
--- a/MAINTAINERS
+++ b
From: SeongJae Park
This commit adds a simple user space tests for DAMON. The tests are
using kselftest framework.
Signed-off-by: SeongJae Park
---
tools/testing/selftests/damon/Makefile| 7 +
.../selftests/damon/_chk_dependency.sh| 28
tools/testing/selftests/damon
From: SeongJae Park
This commit adds kunit based unit tests for DAMON.
Signed-off-by: SeongJae Park
Reviewed-by: Brendan Higgins
---
mm/Kconfig | 11 +
mm/damon-test.h | 622
mm/damon.c | 6 +
3 files changed, 639 insertions
From: SeongJae Park
This commit adds another unit test case for the recording setup.
Signed-off-by: SeongJae Park
---
mm/damon-test.h | 13 +
1 file changed, 13 insertions(+)
diff --git a/mm/damon-test.h b/mm/damon-test.h
index cf715529ff64..5b18619efe72 100644
--- a/mm/damon
From: SeongJae Park
This commit adds a shallow wrapper python script, ``/tools/damon/damo``
that provides more convenient interface. Note that it is only aimed to
be used for minimal reference of the DAMON's debugfs interfaces and for
debugging of the DAMON itself.
Signed-off-by: SeongJae Park
From: SeongJae Park
This commit adds a tracepoint for DAMON. It traces the monitoring
results of each region for each aggregation interval. Using this, DAMON
will be easily integrated with any tracepoints supporting tools such as
perf.
Signed-off-by: SeongJae Park
Reviewed-by: Leonard
From: SeongJae Park
This commit adds a debugfs interface for DAMON.
DAMON exports four files, ``attrs``, ``pids``, ``record``, and
``monitor_on`` under its debugfs directory, ``/damon/``.
Attributes
--
Users can read and write the ``sampling interval``, ``aggregation
interval
From: SeongJae Park
This commit implements the recording feature of DAMON. If this feature
is enabled, DAMON writes the monitored access patterns in its binary
format into a file which specified by the user. This is already able to
be implemented by each user using the callbacks. However
From: SeongJae Park
Only a number of parts in the virtual address space of the processes is
mapped to physical memory and accessed. Thus, tracking the unmapped
address regions is just wasteful. However, tracking every memory
mapping change might incur an overhead. For the reason, DAMON
From: SeongJae Park
This commit implements callbacks for DAMON. Using this, DAMON users can
install their callbacks for each step of the access monitoring so that
they can do something interesting with the monitored access patterns
online. For example, callbacks can report the monitored
From: SeongJae Park
At the beginning of the monitoring, DAMON constructs the initial regions
by evenly splitting the memory mapped address space of the process into
the user-specified minimal number of regions. In this initial state,
the assumption of the regions (pages in same region have
From: SeongJae Park
This commit implements DAMON's basic access check and region based
sampling mechanisms. This change would seems make no sense, mainly
because it is only a part of the DAMON's logics. Following two commits
will make more sense.
Basic Access Check
--
DAMON
From: SeongJae Park
This commit introduces a kernel module named DAMON. Note that this
commit is implementing only the stub for the module load/unload, basic
data structures, and simple manipulation functions of the structures to
keep the size of commit small. The core mechanisms of DAMON
From: SeongJae Park
This commit exports 'lookup_page_ext()' to GPL modules. This will be
used by DAMON.
Signed-off-by: SeongJae Park
Reviewed-by: Leonard Foerster
---
mm/page_ext.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/mm/page_ext.c b/mm/page_ext.c
index a3616f7a0e9e
From: SeongJae Park
Introduction
DAMON is a data access monitoring framework subsystem for the Linux kernel.
The core mechanisms of DAMON called 'region based sampling' and adaptive
regions adjustment' (refer to :doc:`mechanisms` for the detail) make it
- accurate (The monitored
On Wed, 27 May 2020 13:23:56 +0200 Leonard Foerster wrote:
> On 2020-05-25T11:15:02+02:00 SeongJae Park wrote:
>
> > From: SeongJae Park
> >
> > At the beginning of the monitoring, DAMON constructs the initial regions
> > by evenly splitting the memory mappe
On Wed, 27 May 2020 13:23:31 +0200 Leonard Foerster wrote:
> On 2020-05-25T11:15:00+02:00 SeongJae Park wrote:
>
> > From: SeongJae Park
> >
> > This commit introduces a kernel module named DAMON. Note that this
> > commit is implementing only the stub for
From: SeongJae Park
This commit documents DAMON-based operation schemes in the DAMON
document.
Signed-off-by: SeongJae Park
---
Documentation/admin-guide/mm/damon/guide.rst | 35 ++
Documentation/admin-guide/mm/damon/usage.rst | 126 +--
2 files changed, 151 insertions
From: SeongJae Park
This commit implements 'schemes' subcommand of the damon userspace tool.
It can be used to describe and apply the data access monitoring-based
operation schemes in more human friendly fashion.
Signed-off-by: SeongJae Park
---
tools/damon/_convert_damos.py | 128
From: SeongJae Park
This commit adds simple selftets for 'schemes' debugfs file of DAMON.
Signed-off-by: SeongJae Park
---
.../testing/selftests/damon/debugfs_attrs.sh | 29 +++
1 file changed, 29 insertions(+)
diff --git a/tools/testing/selftests/damon/debugfs_attrs.sh
b
From: SeongJae Park
To tune the DAMON-based operation schemes, knowing how many and how
large regions are affected by each of the schemes will be helful. Those
stats could be used for not only the tuning, but also monitoring of the
working set size and the number of regions, if the scheme does
From: SeongJae Park
This commit implements a debugfs interface for the data access
monitoring oriented memory management schemes. It is supposed to be
used by administrators and/or privileged user space programs. Users can
read and update the rules using ``/damon/schemes`` file. The
format
From: SeongJae Park
In many cases, users might use DAMON for simple data access aware
memory management optimizations such as applying an operation scheme to
a memory region of a specific size having a specific access frequency
for a specific time. For example, "page out a memory region l
From: SeongJae Park
DAMON can be used as a primitive for data access pattern aware memory
management optimizations. However, users who want such optimizations
should run DAMON, read the monitoring results, analyze it, plan a new
memory management scheme, and apply the new scheme by themselves
From: SeongJae Park
This commit exports 'do_madvise()' to external GPL modules, so that
other modules including DAMON could use the function.
Signed-off-by: SeongJae Park
---
mm/madvise.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/mm/madvise.c b/mm/madvise.c
index 80f8a1839f70
From: SeongJae Park
DAMON[1] can be used as a primitive for data access awared memory management
optimizations. For that, users who want such optimizations should run DAMON,
read the monitoring results, analyze it, plan a new memory management scheme,
and apply the new scheme by themselves
From: SeongJae Park
This commit updates MAINTAINERS file for DAMON related files.
Signed-off-by: SeongJae Park
---
MAINTAINERS | 12
1 file changed, 12 insertions(+)
diff --git a/MAINTAINERS b/MAINTAINERS
index 5a5332b3591d..586513e92b65 100644
--- a/MAINTAINERS
+++ b
From: SeongJae Park
This commit adds a simple user space tests for DAMON. The tests are
using kselftest framework.
Signed-off-by: SeongJae Park
---
tools/testing/selftests/damon/Makefile| 7 +
.../selftests/damon/_chk_dependency.sh| 28
tools/testing/selftests/damon
From: SeongJae Park
This commit adds kunit based unit tests for DAMON.
Signed-off-by: SeongJae Park
Reviewed-by: Brendan Higgins
---
mm/Kconfig | 11 +
mm/damon-test.h | 622
mm/damon.c | 6 +
3 files changed, 639 insertions
From: SeongJae Park
This commit adds a shallow wrapper python script, ``/tools/damon/damo``
that provides more convenient interface. Note that it is only aimed to
be used for minimal reference of the DAMON's debugfs interfaces and for
debugging of the DAMON itself.
Signed-off-by: SeongJae Park
From: SeongJae Park
This commit adds a tracepoint for DAMON. It traces the monitoring
results of each region for each aggregation interval. Using this, DAMON
will be easily integrated with any tracepoints supporting tools such as
perf.
Signed-off-by: SeongJae Park
---
include/trace/events
From: SeongJae Park
This commit adds a debugfs interface for DAMON.
DAMON exports four files, ``attrs``, ``pids``, ``record``, and
``monitor_on`` under its debugfs directory, ``/damon/``.
Attributes
--
Users can read and write the ``sampling interval``, ``aggregation
interval
From: SeongJae Park
This commit implements the recording feature of DAMON. If this feature
is enabled, DAMON writes the monitored access patterns in its binary
format into a file which specified by the user. This is already able to
be implemented by each user using the callbacks. However
From: SeongJae Park
This commit implements callbacks for DAMON. Using this, DAMON users can
install their callbacks for each step of the access monitoring so that
they can do something interesting with the monitored access patterns
online. For example, callbacks can report the monitored
From: SeongJae Park
Only a number of parts in the virtual address space of the processes is
mapped to physical memory and accessed. Thus, tracking the unmapped
address regions is just wasteful. However, tracking every memory
mapping change might incur an overhead. For the reason, DAMON
From: SeongJae Park
At the beginning of the monitoring, DAMON constructs the initial regions
by evenly splitting the memory mapped address space of the process into
the user-specified minimal number of regions. In this initial state,
the assumption of the regions (pages in same region have
From: SeongJae Park
This commit implements DAMON's basic access check and region based
sampling mechanisms. This change would seems make no sense, mainly
because it is only a part of the DAMON's logics. Following two commits
will make more sense.
Basic Access Check
--
DAMON
From: SeongJae Park
This commit exports 'lookup_page_ext()' to GPL modules. This will be
used by DAMON.
Signed-off-by: SeongJae Park
---
mm/page_ext.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/mm/page_ext.c b/mm/page_ext.c
index 4ade843ff588..71169b45bba9 100644
--- a/mm/page_ext.c
From: SeongJae Park
This commit introduces a kernel module named DAMON. Note that this
commit is implementing only the stub for the module load/unload, basic
data structures, and simple manipulation functions of the structures to
keep the size of commit small. The core mechanisms of DAMON
From: SeongJae Park
Introduction
DAMON is a data access monitoring framework subsystem for the Linux kernel.
The core mechanisms of DAMON called 'region based sampling' and adaptive
regions adjustment' (refer to :doc:`mechanisms` for the detail) make it
accurate, efficient
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