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Date: Thu, 24 Nov 2016 10:22:18 +0100
From: Jan Kara <jack@...e.cz>
To: Ross Zwisler <ross.zwisler@...ux.intel.com>
Cc: linux-kernel@...r.kernel.org,
Alexander Viro <viro@...iv.linux.org.uk>,
Andrew Morton <akpm@...ux-foundation.org>,
Christoph Hellwig <hch@....de>,
Dan Williams <dan.j.williams@...el.com>,
Dave Chinner <david@...morbit.com>,
Ingo Molnar <mingo@...hat.com>, Jan Kara <jack@...e.cz>,
Matthew Wilcox <mawilcox@...rosoft.com>,
Steven Rostedt <rostedt@...dmis.org>,
linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org,
linux-mm@...ck.org, linux-nvdimm@...ts.01.org
Subject: Re: [PATCH 6/6] dax: add tracepoints to dax_pmd_insert_mapping()
On Wed 23-11-16 11:44:22, Ross Zwisler wrote:
> Add tracepoints to dax_pmd_insert_mapping(), following the same logging
> conventions as the tracepoints in dax_iomap_pmd_fault().
>
> Here is an example PMD fault showing the new tracepoints:
>
> big-1544 [006] .... 48.153479: dax_pmd_fault: shared mapping write
> address 0x10505000 vm_start 0x10200000 vm_end 0x10700000 pgoff 0x200
> max_pgoff 0x1400
>
> big-1544 [006] .... 48.155230: dax_pmd_insert_mapping: shared mapping
> write address 0x10505000 length 0x200000 pfn 0x100600 DEV|MAP radix_entry
> 0xc000e
>
> big-1544 [006] .... 48.155266: dax_pmd_fault_done: shared mapping write
> address 0x10505000 vm_start 0x10200000 vm_end 0x10700000 pgoff 0x200
> max_pgoff 0x1400 NOPAGE
>
> Signed-off-by: Ross Zwisler <ross.zwisler@...ux.intel.com>
Looks good. You can add:
Reviewed-by: Jan Kara <jack@...e.cz>
Honza
> ---
> fs/dax.c | 10 +++++++---
> include/linux/pfn_t.h | 6 ++++++
> include/trace/events/fs_dax.h | 42 ++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 55 insertions(+), 3 deletions(-)
>
> diff --git a/fs/dax.c b/fs/dax.c
> index 2824414..d6ba4a3 100644
> --- a/fs/dax.c
> +++ b/fs/dax.c
> @@ -1236,10 +1236,10 @@ static int dax_pmd_insert_mapping(struct vm_area_struct *vma, pmd_t *pmd,
> .size = PMD_SIZE,
> };
> long length = dax_map_atomic(bdev, &dax);
> - void *ret;
> + void *ret = NULL;
>
> if (length < 0) /* dax_map_atomic() failed */
> - return VM_FAULT_FALLBACK;
> + goto fallback;
> if (length < PMD_SIZE)
> goto unmap_fallback;
> if (pfn_t_to_pfn(dax.pfn) & PG_PMD_COLOUR)
> @@ -1252,13 +1252,17 @@ static int dax_pmd_insert_mapping(struct vm_area_struct *vma, pmd_t *pmd,
> ret = dax_insert_mapping_entry(mapping, vmf, *entryp, dax.sector,
> RADIX_DAX_PMD);
> if (IS_ERR(ret))
> - return VM_FAULT_FALLBACK;
> + goto fallback;
> *entryp = ret;
>
> + trace_dax_pmd_insert_mapping(vma, address, write, length, dax.pfn, ret);
> return vmf_insert_pfn_pmd(vma, address, pmd, dax.pfn, write);
>
> unmap_fallback:
> dax_unmap_atomic(bdev, &dax);
> +fallback:
> + trace_dax_pmd_insert_mapping_fallback(vma, address, write, length,
> + dax.pfn, ret);
> return VM_FAULT_FALLBACK;
> }
>
> diff --git a/include/linux/pfn_t.h b/include/linux/pfn_t.h
> index a3d90b9..033fc7b 100644
> --- a/include/linux/pfn_t.h
> +++ b/include/linux/pfn_t.h
> @@ -15,6 +15,12 @@
> #define PFN_DEV (1ULL << (BITS_PER_LONG_LONG - 3))
> #define PFN_MAP (1ULL << (BITS_PER_LONG_LONG - 4))
>
> +#define PFN_FLAGS_TRACE \
> + { PFN_SG_CHAIN, "SG_CHAIN" }, \
> + { PFN_SG_LAST, "SG_LAST" }, \
> + { PFN_DEV, "DEV" }, \
> + { PFN_MAP, "MAP" }
> +
> static inline pfn_t __pfn_to_pfn_t(unsigned long pfn, u64 flags)
> {
> pfn_t pfn_t = { .val = pfn | (flags & PFN_FLAGS_MASK), };
> diff --git a/include/trace/events/fs_dax.h b/include/trace/events/fs_dax.h
> index 8814b1a..a03f820 100644
> --- a/include/trace/events/fs_dax.h
> +++ b/include/trace/events/fs_dax.h
> @@ -87,6 +87,48 @@ 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 vm_area_struct *vma, unsigned long address, int write,
> + long length, pfn_t pfn, void *radix_entry),
> + TP_ARGS(vma, address, write, length, pfn, radix_entry),
> + TP_STRUCT__entry(
> + __field(unsigned long, vm_flags)
> + __field(unsigned long, address)
> + __field(int, write)
> + __field(long, length)
> + __field(u64, pfn_val)
> + __field(void *, radix_entry)
> + ),
> + TP_fast_assign(
> + __entry->vm_flags = vma->vm_flags;
> + __entry->address = address;
> + __entry->write = write;
> + __entry->length = length;
> + __entry->pfn_val = pfn.val;
> + __entry->radix_entry = radix_entry;
> + ),
> + TP_printk("%s mapping %s address %#lx length %#lx pfn %#llx %s"
> + " radix_entry %#lx",
> + __entry->vm_flags & VM_SHARED ? "shared" : "private",
> + __entry->write ? "write" : "read",
> + __entry->address,
> + __entry->length,
> + __entry->pfn_val & ~PFN_FLAGS_MASK,
> + __print_flags(__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 vm_area_struct *vma, unsigned long address, \
> + int write, long length, pfn_t pfn, void *radix_entry), \
> + TP_ARGS(vma, address, write, length, pfn, radix_entry))
> +
> +DEFINE_PMD_INSERT_MAPPING_EVENT(dax_pmd_insert_mapping);
> +DEFINE_PMD_INSERT_MAPPING_EVENT(dax_pmd_insert_mapping_fallback);
> +
> #endif /* _TRACE_FS_DAX_H */
>
> /* This part must be outside protection */
> --
> 2.7.4
>
--
Jan Kara <jack@...e.com>
SUSE Labs, CR
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