On Wed, Oct 23, 2024 at 4:25 PM Arnd Bergmann wrote:
>
> On Wed, Oct 23, 2024, at 07:06, Masahiro Yamada wrote:
> > On Tue, Oct 22, 2024 at 9:00 AM Rong Xu wrote:
> >
> >> > > +===
> >> > > +
> >> > > +Configure the kernel with::
> >> > > +
> >> > > + CONFIG_AUTOFDO_CLANG=y
> >> >
> >>
On 23.10.24 09:42, Heiko Carstens wrote:
On Mon, Oct 21, 2024 at 04:45:59PM +0200, David Hildenbrand wrote:
For my purpose (virtio-mem), it's sufficient to only support "kexec
triggered kdump" either way, so I don't care.
So for me it's good enough to have
bool is_kdump_kernel(void)
{
On Mon, Oct 21, 2024 at 04:45:59PM +0200, David Hildenbrand wrote:
> For my purpose (virtio-mem), it's sufficient to only support "kexec
> triggered kdump" either way, so I don't care.
>
> So for me it's good enough to have
>
> bool is_kdump_kernel(void)
> {
> return oldmem_data.start;
> }
Hi Leo,
leocst...@gmail.com wrote on Tue, 22 Oct 2024 21:12:01 -0700:
> Fix grammar where it improves readability.
>
> Signed-off-by: Leo Stone
Reviewed-by: Miquel Raynal
Thanks,
Miquèl
On Tue, Oct 22, 2024 at 9:00 AM Rong Xu wrote:
> > > +===
> > > +
> > > +Configure the kernel with::
> > > +
> > > + CONFIG_AUTOFDO_CLANG=y
> >
> >
> > This is automatically met due to "depends on AUTOFDO_CLANG".
>
> Agreed. But we will remove the dependency from PROPELlER_CLANG to
> A
On Wed, Oct 23, 2024, at 07:06, Masahiro Yamada wrote:
> On Tue, Oct 22, 2024 at 9:00 AM Rong Xu wrote:
>
>> > > +===
>> > > +
>> > > +Configure the kernel with::
>> > > +
>> > > + CONFIG_AUTOFDO_CLANG=y
>> >
>> >
>> > This is automatically met due to "depends on AUTOFDO_CLANG".
>>
>> Ag
Hi David,
David Hildenbrand writes:
> Staring at the powerpc implementation:
>
> /*
> * Return true only when kexec based kernel dump capturing method is used.
> * This ensures all restritions applied for kdump case are not automatically
> * applied for fadump case.
> */
> bool is_kdump
While Propeller often works best with AutoFDO (or the instrumentation
based FDO), it's not required. One can use Propeller (or similar
post-link-optimizer, like Bolt) on plain kernel builds.
So I will remove "depends on AUTOFDO_CLANG". I will not use "imply" --
simpler is better here.
-Rong
On W
> On 19 Oct 2024, at 17:15, David Woodhouse wrote:
>
> From: David Woodhouse
>
> As with PSCI v1.1 in commit 512865d83fd9 ("KVM: arm64: Bump guest PSCI
> version to 1.1"), expose v1.3 to the guest by default. The SYSTEM_OFF2
> call which is exposed by doing so is compatible for userspace bec
Hi David,
> On 19 Oct 2024, at 17:15, David Woodhouse wrote:
>
> From: David Woodhouse
>
> The PSCI v1.3 specification adds support for a SYSTEM_OFF2 function
> which is analogous to ACPI S4 state. This will allow hosting
> environments to determine that a guest is hibernated rather than just
anish kumar writes:
> This patch series transitions the documentation
> for remoteproc from the staging directory to the
> mainline kernel. It introduces both kernel and
> user-space APIs, enhancing the overall documentation
> quality.
>
> V4:
> Fixed compilation errors and moved documentation to
Implement a helper function to disable memory allocation profiling and
use it when creation of /proc/allocinfo fails.
Ensure /proc/allocinfo does not get created when memory allocation
profiling is disabled.
Signed-off-by: Suren Baghdasaryan
---
lib/alloc_tag.c | 33 ++---
On Wed, Oct 23, 2024 at 1:08 PM Suren Baghdasaryan wrote:
>
> Add mas_for_each_rev() function to iterate maple tree nodes in reverse
> order.
>
> Suggested-by: Liam R. Howlett
> Signed-off-by: Suren Baghdasaryan
> Reviewed-by: Liam R. Howlett
Reviewed-by: Pasha Tatashin
> ---
> include/linu
On Wed, Oct 23, 2024 at 1:08 PM Suren Baghdasaryan wrote:
>
> To simplify later changes to page tag references, introduce new
> pgtag_ref_handle type. This allows easy replacement of page_ext
> as a storage of page allocation tags.
>
> Signed-off-by: Suren Baghdasaryan
Reviewed-by: Pasha Tatashi
Jonathan Corbet writes:
> anish kumar writes:
>
>> This patch series transitions the documentation
>> for remoteproc from the staging directory to the
>> mainline kernel. It introduces both kernel and
>> user-space APIs, enhancing the overall documentation
>> quality.
>>
>> V4:
>> Fixed compilat
On Wed, Oct 23, 2024 at 1:08 PM Suren Baghdasaryan wrote:
>
> Implement a helper function to disable memory allocation profiling and
> use it when creation of /proc/allocinfo fails.
> Ensure /proc/allocinfo does not get created when memory allocation
> profiling is disabled.
>
> Signed-off-by: Sur
On Wed, Oct 23, 2024 at 1:08 PM Suren Baghdasaryan wrote:
>
> When a module gets unloaded there is a possibility that some of the
> allocations it made are still used and therefore the allocation tags
> corresponding to these allocations are still referenced. As such, the
> memory for these tags c
On Wed, Oct 23, 2024 at 1:08 PM Suren Baghdasaryan wrote:
>
> Implement support for storing page allocation tag references directly
> in the page flags instead of page extensions. sysctl.vm.mem_profiling
> boot parameter it extended to provide a way for a user to request this
> mode. Enabling comp
On Wed, Oct 23, 2024 at 1:08 PM Suren Baghdasaryan wrote:
>
> The memory reserved for module tags does not need to be backed by
> physical pages until there are tags to store there. Change the way
> we reserve this memory to allocate only virtual area for the tags
> and populate it with physical p
This patchset implements several improvements:
1. Gracefully handles module unloading while there are used allocations
allocated from that module;
2. Provides an option to store page allocation tag references in the
page flags, removing dependency on page extensions and eliminating the
memory overh
Add mas_for_each_rev() function to iterate maple tree nodes in reverse
order.
Suggested-by: Liam R. Howlett
Signed-off-by: Suren Baghdasaryan
Reviewed-by: Liam R. Howlett
---
include/linux/maple_tree.h | 14 ++
1 file changed, 14 insertions(+)
diff --git a/include/linux/maple_tree
When a module gets unloaded there is a possibility that some of the
allocations it made are still used and therefore the allocation tags
corresponding to these allocations are still referenced. As such, the
memory for these tags can't be freed. This is currently handled as an
abnormal situation and
To simplify later changes to page tag references, introduce new
pgtag_ref_handle type. This allows easy replacement of page_ext
as a storage of page allocation tags.
Signed-off-by: Suren Baghdasaryan
---
include/linux/mm.h | 25 +-
include/linux/pgalloc_tag.h | 92 ++
The memory reserved for module tags does not need to be backed by
physical pages until there are tags to store there. Change the way
we reserve this memory to allocate only virtual area for the tags
and populate it with physical pages as needed when we load a module.
Signed-off-by: Suren Baghdasar
> On 19 Oct 2024, at 17:15, David Woodhouse wrote:
>
> From: David Woodhouse
>
> The v1.3 PSCI spec (https://developer.arm.com/documentation/den0022) adds
> the SYSTEM_OFF2 function. Add definitions for it and its hibernation type
> parameter.
>
> Signed-off-by: David Woodhouse
> ---
> inc
Alistair Popple writes:
> Alistair Popple wrote:
>> Dan Williams writes:
[...]
>>> +
>>> + return VM_FAULT_NOPAGE;
>>> +}
>>> +EXPORT_SYMBOL_GPL(dax_insert_pfn_pmd);
>>
>> Like I mentioned before, lets make the exported function
>> vmf_insert_folio() and move the pte, pmd, pud internal pri
Add the build support for using Clang's AutoFDO. Building the kernel
with AutoFDO does not reduce the optimization level from the
compiler. AutoFDO uses hardware sampling to gather information about
the frequency of execution of different code paths within a binary.
This information is then used to
Alistair Popple wrote:
>
> Alistair Popple writes:
>
> > Alistair Popple wrote:
> >> Dan Williams writes:
>
> [...]
>
> >>> +
> >>> + return VM_FAULT_NOPAGE;
> >>> +}
> >>> +EXPORT_SYMBOL_GPL(dax_insert_pfn_pmd);
> >>
> >> Like I mentioned before, lets make the exported function
> >> vmf_inse
Hi,
This patch series is to integrate AutoFDO and Propeller support into
the Linux kernel. AutoFDO is a profile-guided optimization technique
that leverages hardware sampling to enhance binary performance.
Unlike Instrumentation-based FDO (iFDO), AutoFDO offers a user-friendly
and straightforward
In the presence of both weak and strong function definitions, the
linker drops the weak symbol in favor of a strong symbol, but
leaves the code in place. Code in ignore_unreachable_insn() has
some heuristics to suppress the warning, but it does not work when
-ffunction-sections is enabled.
Suppose
Add the build support for using Clang's Propeller optimizer. Like
AutoFDO, Propeller uses hardware sampling to gather information
about the frequency of execution of different code paths within a
binary. This information is then used to guide the compiler's
optimization decisions, resulting in a mo
Enable -ffunction-sections by default for the AutoFDO build.
With -ffunction-sections, the compiler places each function in its own
section named .text.function_name instead of placing all functions in
the .text section. In the AutoFDO build, this allows the linker to
utilize profile information t
When the -ffunction-sections compiler option is enabled, each function
is placed in a separate section named .text.function_name rather than
putting all functions in a single .text section.
However, using -function-sections can cause problems with the
linker script. The comments included in includ
Enable the machine function split optimization for AutoFDO in Clang.
Machine function split (MFS) is a pass in the Clang compiler that
splits a function into hot and cold parts. The linker groups all
cold blocks across functions together. This decreases hot code
fragmentation and improves iCache a
Add markers like __hot_text_start, __hot_text_end, __unlikely_text_start,
and __unlikely_text_end which will be included in System.map. These markers
indicate how the compiler groups functions, providing valuable information
to developers about the layout and optimization of the code.
Co-developed
On Wed, 23 Oct 2024 at 07:53, Jonathan Corbet wrote:
>
> anish kumar writes:
>
> > This patch series transitions the documentation
> > for remoteproc from the staging directory to the
> > mainline kernel. It introduces both kernel and
> > user-space APIs, enhancing the overall documentation
> > q
On Tue, Oct 22, 2024 at 11:50 PM Masahiro Yamada wrote:
>
> On Tue, Oct 22, 2024 at 8:28 AM Rong Xu wrote:
> >
> > On Sun, Oct 20, 2024 at 8:18 PM Masahiro Yamada
> > wrote:
> > >
> > > On Tue, Oct 15, 2024 at 6:33 AM Rong Xu wrote:
> > > >
> > > > Enable the machine function split optimizatio
Implement support for storing page allocation tag references directly
in the page flags instead of page extensions. sysctl.vm.mem_profiling
boot parameter it extended to provide a way for a user to request this
mode. Enabling compression eliminates memory overhead caused by page_ext
and results in
On Wed, 23 Oct 2024 10:07:58 -0700 Suren Baghdasaryan wrote:
> To simplify later changes to page tag references, introduce new
> pgtag_ref_handle type. This allows easy replacement of page_ext
> as a storage of page allocation tags.
>
> ...
>
> static inline void pgalloc_tag_copy(struct folio *
On Wed, Oct 23, 2024 at 2:00 PM Andrew Morton wrote:
>
> On Wed, 23 Oct 2024 10:07:58 -0700 Suren Baghdasaryan
> wrote:
>
> > To simplify later changes to page tag references, introduce new
> > pgtag_ref_handle type. This allows easy replacement of page_ext
> > as a storage of page allocation ta
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