From 653b2ea3396fda0b5e23a37b3356dd2ca82fe5c1 Mon Sep 17 00:00:00 2001 From: Ross Zwisler Date: Wed, 22 Feb 2017 15:39:57 -0800 Subject: dax: add tracepoints to dax_pmd_load_hole() Add tracepoints to dax_pmd_load_hole(), following the same logging conventions as the tracepoints in dax_iomap_pmd_fault(). Here is an example PMD fault showing the new tracepoints: read_big-1478 [004] .... 238.242188: xfs_filemap_pmd_fault: dev 259:0 ino 0x1003 read_big-1478 [004] .... 238.242191: dax_pmd_fault: dev 259:0 ino 0x1003 shared ALLOW_RETRY|KILLABLE|USER address 0x10400000 vm_start 0x10200000 vm_end 0x10600000 pgoff 0x200 max_pgoff 0x1400 read_big-1478 [004] .... 238.242390: dax_pmd_load_hole: dev 259:0 ino 0x1003 shared address 0x10400000 zero_page ffffea0002c20000 radix_entry 0x1e read_big-1478 [004] .... 238.242392: dax_pmd_fault_done: dev 259:0 ino 0x1003 shared ALLOW_RETRY|KILLABLE|USER address 0x10400000 vm_start 0x10200000 vm_end 0x10600000 pgoff 0x200 max_pgoff 0x1400 NOPAGE Link: http://lkml.kernel.org/r/1484085142-2297-5-git-send-email-ross.zwisler@linux.intel.com Signed-off-by: Ross Zwisler Reviewed-by: Jan Kara Acked-by: Steven Rostedt Cc: Dave Chinner Cc: Dave Jiang Cc: Matthew Wilcox Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/dax.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) (limited to 'fs/dax.c') diff --git a/fs/dax.c b/fs/dax.c index dc11a2b90731..a622961a717c 100644 --- a/fs/dax.c +++ b/fs/dax.c @@ -1299,33 +1299,39 @@ static int dax_pmd_load_hole(struct vm_area_struct *vma, pmd_t *pmd, { struct address_space *mapping = vma->vm_file->f_mapping; unsigned long pmd_addr = address & PMD_MASK; + struct inode *inode = mapping->host; struct page *zero_page; + void *ret = NULL; spinlock_t *ptl; pmd_t pmd_entry; - void *ret; zero_page = mm_get_huge_zero_page(vma->vm_mm); if (unlikely(!zero_page)) - return VM_FAULT_FALLBACK; + goto fallback; ret = dax_insert_mapping_entry(mapping, vmf, *entryp, 0, RADIX_DAX_PMD | RADIX_DAX_HZP); if (IS_ERR(ret)) - return VM_FAULT_FALLBACK; + goto fallback; *entryp = ret; ptl = pmd_lock(vma->vm_mm, pmd); if (!pmd_none(*pmd)) { spin_unlock(ptl); - return VM_FAULT_FALLBACK; + goto fallback; } pmd_entry = mk_pmd(zero_page, vma->vm_page_prot); pmd_entry = pmd_mkhuge(pmd_entry); set_pmd_at(vma->vm_mm, pmd_addr, pmd, pmd_entry); spin_unlock(ptl); + trace_dax_pmd_load_hole(inode, vma, address, zero_page, ret); return VM_FAULT_NOPAGE; + +fallback: + trace_dax_pmd_load_hole_fallback(inode, vma, address, zero_page, ret); + return VM_FAULT_FALLBACK; } int dax_iomap_pmd_fault(struct vm_area_struct *vma, unsigned long address, -- cgit v1.2.3