Re: [PATCH v6 42/42] x86/resctrl: Add python script to move resctrl code to /fs/resctrl

[Moger, Babu]

Hi All,

On 2/24/2025 11:02 PM, Fenghua Yu wrote:
> Hi, James and Reinette,
>
> On 2/7/25 10:18, James Morse wrote:
> > To support more than one architecture resctrl needs to move from arch/x86
> > to live under fs. Moving all the code breaks any series on the mailing
> > list, so needs scheduling carefully.
> >
> > Maintaining the patch that moves all this code has proved labour 
> > intensive.
> > It's also near-impossible to review that no inadvertent changes have
> > crept in.
> >
> > To solve these problems, temporarily add a hacky python program that
> > lists all the functions that should move, and those that should stay.
> >
> > No attempt to parse C code is made, this thing tries to name 'blocks'
> > based on hueristics about the kernel coding style. It's fragile, but
> > good enough for its single use here.
> >
> > This only exists to show I have nothing up my sleeve.
> > I don't suggested this gets merged.
> >
> > The patch this script generaets has the following corner cases:
> > * The original files are regenerated, which will add newlines that are
> >    not present in the original file.
> > * An trace-point header file the only contains boiler-plate is created
> >    in the arch and filesystem code. The parser doesn't know how to remove
> >    the includes for these - but its easy to 'keep' the file contents on
> >    the correct side. A follow-up patch will remove these files and their
> >    includes.
>
> Due to no trace event defined in the _trace.h files, compilation errors 
> are reported when building kernel by W=1.
>
> This patch seems the "follow-up" patch mentioned here? After this patch 
> is applied, no more errors reported when W=1.
>
> diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/ 
> cpu/resctrl/monitor.c
> index 1809e3fe6ef3..800e52845b1d 100644
> --- a/arch/x86/kernel/cpu/resctrl/monitor.c
> +++ b/arch/x86/kernel/cpu/resctrl/monitor.c
> @@ -27,10 +27,6 @@
>
>   #include "internal.h"
>
> -#define CREATE_TRACE_POINTS
> -
> -#include "monitor_trace.h"
> -
>   /*
>    * Global boolean for rdt_monitor which is true if any
>    * resource monitoring is enabled.
> diff --git a/arch/x86/kernel/cpu/resctrl/monitor_trace.h b/arch/x86/ 
> kernel/cpu/resctrl/monitor_trace.h
> deleted file mode 100644
> index b5a142dd0f0e..000000000000
> --- a/arch/x86/kernel/cpu/resctrl/monitor_trace.h
> +++ /dev/null
> @@ -1,17 +0,0 @@
> -/* SPDX-License-Identifier: GPL-2.0 */
> -#undef TRACE_SYSTEM
> -#define TRACE_SYSTEM resctrl
> -
> -#if !defined(_FS_RESCTRL_MONITOR_TRACE_H) || 
> defined(TRACE_HEADER_MULTI_READ)
> -#define _FS_RESCTRL_MONITOR_TRACE_H
> -
> -#include <linux/tracepoint.h>
> -
> -#endif /* _FS_RESCTRL_MONITOR_TRACE_H */
> -
> -#undef TRACE_INCLUDE_PATH
> -#define TRACE_INCLUDE_PATH .
> -
> -#define TRACE_INCLUDE_FILE monitor_trace
> -
> -#include <trace/define_trace.h>
> diff --git a/fs/resctrl/pseudo_lock.c b/fs/resctrl/pseudo_lock.c
> index d8389779835d..6c49dd60174f 100644
> --- a/fs/resctrl/pseudo_lock.c
> +++ b/fs/resctrl/pseudo_lock.c
> @@ -29,10 +29,6 @@
>   #include "../../events/perf_event.h" /* For X86_CONFIG() */
>   #include "internal.h"
>
> -#define CREATE_TRACE_POINTS
> -
> -#include "pseudo_lock_trace.h"
> -
>   /*
>    * Major number assigned to and shared by all devices exposing
>    * pseudo-locked regions.
> diff --git a/fs/resctrl/pseudo_lock_trace.h b/fs/resctrl/ 
> pseudo_lock_trace.h
> deleted file mode 100644
> index 7a6a1983953a..000000000000
> --- a/fs/resctrl/pseudo_lock_trace.h
> +++ /dev/null
> @@ -1,17 +0,0 @@
> -/* SPDX-License-Identifier: GPL-2.0 */
> -#undef TRACE_SYSTEM
> -#define TRACE_SYSTEM resctrl
> -
> -#if !defined(_X86_RESCTRL_PSEUDO_LOCK_TRACE_H) || 
> defined(TRACE_HEADER_MULTI_READ)
> -#define _X86_RESCTRL_PSEUDO_LOCK_TRACE_H
> -
> -#include <linux/tracepoint.h>
> -
> -#endif /* _X86_RESCTRL_PSEUDO_LOCK_TRACE_H */
> -
> -#undef TRACE_INCLUDE_PATH
> -#define TRACE_INCLUDE_PATH .
> -
> -#define TRACE_INCLUDE_FILE pseudo_lock_trace
> -
> -#include <trace/define_trace.h>

Just to confirm. I had the same build issues. This patch resolved the 
problem. Booted the system and ran basic resctrl tests and everything 
worked as expected.

Thanks
Babu