From: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx> Subject: 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@xxxxxxxxxxxxxxx Signed-off-by: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx> Reviewed-by: Jan Kara <jack@xxxxxxx> Acked-by: Steven Rostedt <rostedt@xxxxxxxxxxx> Cc: Dave Chinner <david@xxxxxxxxxxxxx> Cc: Dave Jiang <dave.jiang@xxxxxxxxx> Cc: Matthew Wilcox <mawilcox@xxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- fs/dax.c | 12 +++++-- include/linux/pfn_t.h | 6 +++ include/trace/events/fs_dax.h | 51 ++++++++++++++++++++++++++++++++ 3 files changed, 66 insertions(+), 3 deletions(-) diff -puN fs/dax.c~dax-add-tracepoints-to-dax_pmd_insert_mapping fs/dax.c --- a/fs/dax.c~dax-add-tracepoints-to-dax_pmd_insert_mapping +++ a/fs/dax.c @@ -1262,15 +1262,16 @@ static int dax_pmd_insert_mapping(struct { 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 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; } diff -puN include/linux/pfn_t.h~dax-add-tracepoints-to-dax_pmd_insert_mapping include/linux/pfn_t.h --- a/include/linux/pfn_t.h~dax-add-tracepoints-to-dax_pmd_insert_mapping +++ a/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 -puN include/trace/events/fs_dax.h~dax-add-tracepoints-to-dax_pmd_insert_mapping include/trace/events/fs_dax.h --- a/include/trace/events/fs_dax.h~dax-add-tracepoints-to-dax_pmd_insert_mapping +++ a/include/trace/events/fs_dax.h @@ -104,6 +104,57 @@ DEFINE_EVENT(dax_pmd_load_hole_class, na 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 */ _ -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
