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dax: add tracepoints to dax_pmd_insert_mapping() 

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-1504  [001] ....   326.960743: xfs_filemap_pmd_fault: dev 259:0 ino 0x1003

big-1504  [001] ....   326.960753: dax_pmd_fault: dev 259:0 ino 0x1003 shared WRITE|ALLOW_RETRY|KILLABLE|USER address 0x10505000 vm_start 0x10200000 vm_end 0x10700000 pgoff 0x200 max_pgoff 0x1400

big-1504  [001] ....   326.960981: dax_pmd_insert_mapping: dev 259:0 ino 0x1003 shared write address 0x10505000 length 0x200000 pfn 0x100600 DEV|MAP radix_entry 0xc000e

big-1504  [001] ....   326.960986: dax_pmd_fault_done: dev 259:0 ino 0x1003 shared WRITE|ALLOW_RETRY|KILLABLE|USER address 0x10505000 vm_start 0x10200000 vm_end 0x10700000 pgoff 0x200 max_pgoff 0x1400 NOPAGE

Link: http://lkml.kernel.org/r/1484085142-2297-6-git-send-email-ross.zwisler@linux.intel.com
Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Dave Jiang <dave.jiang@intel.com>
Cc: Matthew Wilcox <mawilcox@microsoft.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Ross Zwisler 2017-02-22 15:40:00 -08:00 committed by Linus Torvalds
parent 653b2ea339
commit 27a7ffaccd
3 changed files with 66 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
fs/dax.c
View File

@ -1262,15 +1262,16 @@ static int dax_pmd_insert_mapping(struct vm_area_struct *vma, pmd_t *pmd,
{
struct address_space *mapping = vma->vm_file->f_mapping;
struct block_device *bdev = iomap->bdev;
struct inode *inode = mapping->host;
struct blk_dax_ctl dax = {
.sector = dax_iomap_sector(iomap, pos),
.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)
@ -1283,13 +1284,18 @@ 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(inode, 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(inode, vma, address, write,
length, dax.pfn, ret);
return VM_FAULT_FALLBACK;
}

6
include/linux/pfn_t.h
View File

@ -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), };

51
include/trace/events/fs_dax.h
View File

@ -104,6 +104,57 @@ 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_area_struct *vma,
unsigned long address, int write, long length, pfn_t pfn,
void *radix_entry),
TP_ARGS(inode, vma, address, write, 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 = vma->vm_flags;
__entry->address = address;
__entry->write = 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_area_struct *vma, \
unsigned long address, int write, long length, pfn_t pfn, \
void *radix_entry), \
TP_ARGS(inode, 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 */