diff options
| -rw-r--r-- | fs/dax.c | 30 | ||||
| -rw-r--r-- | include/linux/mm.h | 25 | ||||
| -rw-r--r-- | include/trace/events/fs_dax.h | 68 |
3 files changed, 113 insertions, 10 deletions
@@ -35,6 +35,9 @@ #include <linux/iomap.h> #include "internal.h" +#define CREATE_TRACE_POINTS +#include <trace/events/fs_dax.h> + /* We choose 4096 entries - same as per-zone page wait tables */ #define DAX_WAIT_TABLE_BITS 12 #define DAX_WAIT_TABLE_ENTRIES (1 << DAX_WAIT_TABLE_BITS) @@ -1341,6 +1344,16 @@ int dax_iomap_pmd_fault(struct vm_area_struct *vma, unsigned long address, loff_t pos; int error; + /* + * Check whether offset isn't beyond end of file now. Caller is + * supposed to hold locks serializing us with truncate / punch hole so + * this is a reliable test. + */ + pgoff = linear_page_index(vma, pmd_addr); + max_pgoff = (i_size_read(inode) - 1) >> PAGE_SHIFT; + + trace_dax_pmd_fault(inode, vma, address, flags, pgoff, max_pgoff, 0); + /* Fall back to PTEs if we're going to COW */ if (write && !(vma->vm_flags & VM_SHARED)) goto fallback; @@ -1351,16 +1364,10 @@ int dax_iomap_pmd_fault(struct vm_area_struct *vma, unsigned long address, if ((pmd_addr + PMD_SIZE) > vma->vm_end) goto fallback; - /* - * Check whether offset isn't beyond end of file now. Caller is - * supposed to hold locks serializing us with truncate / punch hole so - * this is a reliable test. - */ - pgoff = linear_page_index(vma, pmd_addr); - max_pgoff = (i_size_read(inode) - 1) >> PAGE_SHIFT; - - if (pgoff > max_pgoff) - return VM_FAULT_SIGBUS; + if (pgoff > max_pgoff) { + result = VM_FAULT_SIGBUS; + goto out; + } /* If the PMD would extend beyond the file size */ if ((pgoff | PG_PMD_COLOUR) > max_pgoff) @@ -1432,6 +1439,9 @@ int dax_iomap_pmd_fault(struct vm_area_struct *vma, unsigned long address, split_huge_pmd(vma, pmd, address); count_vm_event(THP_FAULT_FALLBACK); } +out: + trace_dax_pmd_fault_done(inode, vma, address, flags, pgoff, max_pgoff, + result); return result; } EXPORT_SYMBOL_GPL(dax_iomap_pmd_fault); diff --git a/include/linux/mm.h b/include/linux/mm.h index 6ff66d6fe8e2..d22f7837ad90 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -285,6 +285,17 @@ extern pgprot_t protection_map[16]; #define FAULT_FLAG_REMOTE 0x80 /* faulting for non current tsk/mm */ #define FAULT_FLAG_INSTRUCTION 0x100 /* The fault was during an instruction fetch */ +#define FAULT_FLAG_TRACE \ + { FAULT_FLAG_WRITE, "WRITE" }, \ + { FAULT_FLAG_MKWRITE, "MKWRITE" }, \ + { FAULT_FLAG_ALLOW_RETRY, "ALLOW_RETRY" }, \ + { FAULT_FLAG_RETRY_NOWAIT, "RETRY_NOWAIT" }, \ + { FAULT_FLAG_KILLABLE, "KILLABLE" }, \ + { FAULT_FLAG_TRIED, "TRIED" }, \ + { FAULT_FLAG_USER, "USER" }, \ + { FAULT_FLAG_REMOTE, "REMOTE" }, \ + { FAULT_FLAG_INSTRUCTION, "INSTRUCTION" } + /* * vm_fault is filled by the the pagefault handler and passed to the vma's * ->fault function. The vma's ->fault is responsible for returning a bitmask @@ -1111,6 +1122,20 @@ static inline void clear_page_pfmemalloc(struct page *page) VM_FAULT_HWPOISON | VM_FAULT_HWPOISON_LARGE | \ VM_FAULT_FALLBACK) +#define VM_FAULT_RESULT_TRACE \ + { VM_FAULT_OOM, "OOM" }, \ + { VM_FAULT_SIGBUS, "SIGBUS" }, \ + { VM_FAULT_MAJOR, "MAJOR" }, \ + { VM_FAULT_WRITE, "WRITE" }, \ + { VM_FAULT_HWPOISON, "HWPOISON" }, \ + { VM_FAULT_HWPOISON_LARGE, "HWPOISON_LARGE" }, \ + { VM_FAULT_SIGSEGV, "SIGSEGV" }, \ + { VM_FAULT_NOPAGE, "NOPAGE" }, \ + { VM_FAULT_LOCKED, "LOCKED" }, \ + { VM_FAULT_RETRY, "RETRY" }, \ + { VM_FAULT_FALLBACK, "FALLBACK" }, \ + { VM_FAULT_DONE_COW, "DONE_COW" } + /* Encode hstate index for a hwpoisoned large page */ #define VM_FAULT_SET_HINDEX(x) ((x) << 12) #define VM_FAULT_GET_HINDEX(x) (((x) >> 12) & 0xf) diff --git a/include/trace/events/fs_dax.h b/include/trace/events/fs_dax.h new file mode 100644 index 000000000000..58b0b5612683 --- /dev/null +++ b/include/trace/events/fs_dax.h @@ -0,0 +1,68 @@ +#undef TRACE_SYSTEM +#define TRACE_SYSTEM fs_dax + +#if !defined(_TRACE_FS_DAX_H) || defined(TRACE_HEADER_MULTI_READ) +#define _TRACE_FS_DAX_H + +#include <linux/tracepoint.h> + +DECLARE_EVENT_CLASS(dax_pmd_fault_class, + TP_PROTO(struct inode *inode, struct vm_area_struct *vma, + unsigned long address, unsigned int flags, pgoff_t pgoff, + pgoff_t max_pgoff, int result), + TP_ARGS(inode, vma, address, flags, pgoff, max_pgoff, result), + TP_STRUCT__entry( + __field(unsigned long, ino) + __field(unsigned long, vm_start) + __field(unsigned long, vm_end) + __field(unsigned long, vm_flags) + __field(unsigned long, address) + __field(pgoff_t, pgoff) + __field(pgoff_t, max_pgoff) + __field(dev_t, dev) + __field(unsigned int, flags) + __field(int, result) + ), + TP_fast_assign( + __entry->dev = inode->i_sb->s_dev; + __entry->ino = inode->i_ino; + __entry->vm_start = vma->vm_start; + __entry->vm_end = vma->vm_end; + __entry->vm_flags = vma->vm_flags; + __entry->address = address; + __entry->flags = flags; + __entry->pgoff = pgoff; + __entry->max_pgoff = max_pgoff; + __entry->result = result; + ), + TP_printk("dev %d:%d ino %#lx %s %s address %#lx vm_start " + "%#lx vm_end %#lx pgoff %#lx max_pgoff %#lx %s", + MAJOR(__entry->dev), + MINOR(__entry->dev), + __entry->ino, + __entry->vm_flags & VM_SHARED ? "shared" : "private", + __print_flags(__entry->flags, "|", FAULT_FLAG_TRACE), + __entry->address, + __entry->vm_start, + __entry->vm_end, + __entry->pgoff, + __entry->max_pgoff, + __print_flags(__entry->result, "|", VM_FAULT_RESULT_TRACE) + ) +) + +#define DEFINE_PMD_FAULT_EVENT(name) \ +DEFINE_EVENT(dax_pmd_fault_class, name, \ + TP_PROTO(struct inode *inode, struct vm_area_struct *vma, \ + unsigned long address, unsigned int flags, pgoff_t pgoff, \ + pgoff_t max_pgoff, int result), \ + TP_ARGS(inode, vma, address, flags, pgoff, max_pgoff, result)) + +DEFINE_PMD_FAULT_EVENT(dax_pmd_fault); +DEFINE_PMD_FAULT_EVENT(dax_pmd_fault_done); + + +#endif /* _TRACE_FS_DAX_H */ + +/* This part must be outside protection */ +#include <trace/define_trace.h> |