linux-kernel - Re: [PATCH] fsdax: Remove unused trace event dax_pmd_insert

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Message-ID: <20250531161815.12b11b81@gandalf.local.home>
Date: Sat, 31 May 2025 16:18:15 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: LKML <linux-kernel@...r.kernel.org>, Linux Trace Kernel
 <linux-trace-kernel@...r.kernel.org>, nvdimm@...ts.linux.dev
Cc: Dan Williams <dan.j.williams@...el.com>, Shiyang Ruan
 <ruansy.fnst@...itsu.com>, "Darrick J. Wong" <djwong@...nel.org>, Ross
 Zwisler <zwisler@...nel.org>, Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] fsdax: Remove unused trace event dax_pmd_insert_mapping


Can I get an acked-by, and I'll pull this in through my tree (with the
other patches that remove unused events)?

Thanks,

-- Steve

On Thu, 29 May 2025 15:07:22 -0400
Steven Rostedt <rostedt@...dmis.org> wrote:

> From: Steven Rostedt <rostedt@...dmis.org>
> 
> When the dax_fault_actor() helper was factored out, it removed the calls
> to the dax_pmd_insert_mapping event but never removed the event itself. As
> events created do take up memory (roughly 5K), this is a waste as it is
> never used.
> 
> Remove the unused dax_pmd_insert_mapping trace event.
> 
> Link: https://lore.kernel.org/all/20250529130138.544ffec4@gandalf.local.home/
> 
> Fixes: c2436190e492 ("fsdax: factor out a dax_fault_actor() helper")
> Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
> ---
>  include/trace/events/fs_dax.h | 48 -----------------------------------
>  1 file changed, 48 deletions(-)
> 
> diff --git a/include/trace/events/fs_dax.h b/include/trace/events/fs_dax.h
> index 86fe6aecff1e..4d99ee3b62ea 100644
> --- a/include/trace/events/fs_dax.h
> +++ b/include/trace/events/fs_dax.h
> @@ -102,54 +102,6 @@ DEFINE_EVENT(dax_pmd_load_hole_class, name, \
>  DEFINE_PMD_LOAD_HOLE_EVENT(dax_pmd_load_hole);
>  DEFINE_PMD_LOAD_HOLE_EVENT(dax_pmd_load_hole_fallback);
>  
> -DECLARE_EVENT_CLASS(dax_pmd_insert_mapping_class,
> -	TP_PROTO(struct inode *inode, struct vm_fault *vmf,
> -		long length, pfn_t pfn, void *radix_entry),
> -	TP_ARGS(inode, vmf, length, pfn, radix_entry),
> -	TP_STRUCT__entry(
> -		__field(unsigned long, ino)
> -		__field(unsigned long, vm_flags)
> -		__field(unsigned long, address)
> -		__field(long, length)
> -		__field(u64, pfn_val)
> -		__field(void *, radix_entry)
> -		__field(dev_t, dev)
> -		__field(int, write)
> -	),
> -	TP_fast_assign(
> -		__entry->dev = inode->i_sb->s_dev;
> -		__entry->ino = inode->i_ino;
> -		__entry->vm_flags = vmf->vma->vm_flags;
> -		__entry->address = vmf->address;
> -		__entry->write = vmf->flags & FAULT_FLAG_WRITE;
> -		__entry->length = length;
> -		__entry->pfn_val = pfn.val;
> -		__entry->radix_entry = radix_entry;
> -	),
> -	TP_printk("dev %d:%d ino %#lx %s %s address %#lx length %#lx "
> -			"pfn %#llx %s radix_entry %#lx",
> -		MAJOR(__entry->dev),
> -		MINOR(__entry->dev),
> -		__entry->ino,
> -		__entry->vm_flags & VM_SHARED ? "shared" : "private",
> -		__entry->write ? "write" : "read",
> -		__entry->address,
> -		__entry->length,
> -		__entry->pfn_val & ~PFN_FLAGS_MASK,
> -		__print_flags_u64(__entry->pfn_val & PFN_FLAGS_MASK, "|",
> -			PFN_FLAGS_TRACE),
> -		(unsigned long)__entry->radix_entry
> -	)
> -)
> -
> -#define DEFINE_PMD_INSERT_MAPPING_EVENT(name) \
> -DEFINE_EVENT(dax_pmd_insert_mapping_class, name, \
> -	TP_PROTO(struct inode *inode, struct vm_fault *vmf, \
> -		long length, pfn_t pfn, void *radix_entry), \
> -	TP_ARGS(inode, vmf, length, pfn, radix_entry))
> -
> -DEFINE_PMD_INSERT_MAPPING_EVENT(dax_pmd_insert_mapping);
> -
>  DECLARE_EVENT_CLASS(dax_pte_fault_class,
>  	TP_PROTO(struct inode *inode, struct vm_fault *vmf, int result),
>  	TP_ARGS(inode, vmf, result),