There is a wide gamut of conditions that can trigger the dax pmd path to
fallback to pte mappings. Ideally we'd have a syscall interface to
determine mapping characteristics after the fact. In the meantime
provide debug messages.
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
---
fs/dax.c | 57 ++++++++++++++++++++++++++++++++++++++++++++++++---------
1 file changed, 48 insertions(+), 9 deletions(-)
diff --git a/fs/dax.c b/fs/dax.c
index 27ded3c6df64..a8b82a75dfa8 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -557,6 +557,14 @@ EXPORT_SYMBOL_GPL(dax_fault);
*/
#define PG_PMD_COLOUR ((PMD_SIZE >> PAGE_SHIFT) - 1)
+static void dax_pmd_dbg(struct block_device *bdev, unsigned long address,
+ const char *reason)
+{
+ pr_debug("%s%s dax_pmd: %s addr: %lx fallback: %s\n", bdev
+ ? dev_name(part_to_dev(bdev->bd_part)) : "", bdev
+ ? ": " : "", current->comm, address, reason);
+}
+
int __dax_pmd_fault(struct vm_area_struct *vma, unsigned long address,
pmd_t *pmd, unsigned int flags, get_block_t get_block,
dax_iodone_t complete_unwritten)
@@ -568,7 +576,7 @@ int __dax_pmd_fault(struct vm_area_struct *vma, unsigned long address,
unsigned blkbits = inode->i_blkbits;
unsigned long pmd_addr = address & PMD_MASK;
bool write = flags & FAULT_FLAG_WRITE;
- struct block_device *bdev;
+ struct block_device *bdev = NULL;
pgoff_t size, pgoff;
sector_t block;
int result = 0;
@@ -580,21 +588,29 @@ int __dax_pmd_fault(struct vm_area_struct *vma, unsigned long address,
/* Fall back to PTEs if we're going to COW */
if (write && !(vma->vm_flags & VM_SHARED)) {
split_huge_pmd(vma, pmd, address);
+ dax_pmd_dbg(bdev, address, "cow write");
return VM_FAULT_FALLBACK;
}
/* If the PMD would extend outside the VMA */
- if (pmd_addr < vma->vm_start)
+ if (pmd_addr < vma->vm_start) {
+ dax_pmd_dbg(bdev, address, "vma start unaligned");
return VM_FAULT_FALLBACK;
- if ((pmd_addr + PMD_SIZE) > vma->vm_end)
+ }
+ if ((pmd_addr + PMD_SIZE) > vma->vm_end) {
+ dax_pmd_dbg(bdev, address, "vma end unaligned");
return VM_FAULT_FALLBACK;
+ }
pgoff = linear_page_index(vma, pmd_addr);
size = (i_size_read(inode) + PAGE_SIZE - 1) >> PAGE_SHIFT;
if (pgoff >= size)
return VM_FAULT_SIGBUS;
/* If the PMD would cover blocks out of the file */
- if ((pgoff | PG_PMD_COLOUR) >= size)
+ if ((pgoff | PG_PMD_COLOUR) >= size) {
+ dax_pmd_dbg(bdev, address,
+ "offset + huge page size > file size");
return VM_FAULT_FALLBACK;
+ }
memset(&bh, 0, sizeof(bh));
block = (sector_t)pgoff << (PAGE_SHIFT - blkbits);
@@ -610,8 +626,10 @@ int __dax_pmd_fault(struct vm_area_struct *vma, unsigned long address,
* just fall back to PTEs. Calling get_block 512 times in a loop
* would be silly.
*/
- if (!buffer_size_valid(&bh) || bh.b_size < PMD_SIZE)
+ if (!buffer_size_valid(&bh) || bh.b_size < PMD_SIZE) {
+ dax_pmd_dbg(bdev, address, "block allocation size invalid");
goto fallback;
+ }
/*
* If we allocated new storage, make sure no process has any
@@ -634,23 +652,33 @@ int __dax_pmd_fault(struct vm_area_struct *vma, unsigned long address,
result = VM_FAULT_SIGBUS;
goto out;
}
- if ((pgoff | PG_PMD_COLOUR) >= size)
+ if ((pgoff | PG_PMD_COLOUR) >= size) {
+ dax_pmd_dbg(bdev, address, "pgoff unaligned");
goto fallback;
+ }
if (!write && !buffer_mapped(&bh) && buffer_uptodate(&bh)) {
spinlock_t *ptl;
pmd_t entry;
struct page *zero_page = get_huge_zero_page();
- if (unlikely(!zero_page))
+ if (unlikely(!zero_page)) {
+ dax_pmd_dbg(bdev, address, "no zero page");
goto fallback;
+ }
ptl = pmd_lock(vma->vm_mm, pmd);
if (!pmd_none(*pmd)) {
spin_unlock(ptl);
+ dax_pmd_dbg(bdev, address, "pmd already present");
goto fallback;
}
+ dev_dbg(part_to_dev(bdev->bd_part),
+ "%s: %s addr: %lx pfn: <zero> sect: %llx\n",
+ __func__, current->comm, address,
+ (unsigned long long) to_sector(&bh, inode));
+
entry = mk_pmd(zero_page, vma->vm_page_prot);
entry = pmd_mkhuge(entry);
set_pmd_at(vma->vm_mm, pmd_addr, pmd, entry);
@@ -667,8 +695,13 @@ int __dax_pmd_fault(struct vm_area_struct *vma, unsigned long address,
result = VM_FAULT_SIGBUS;
goto out;
}
- if (length < PMD_SIZE
- || (pfn_t_to_pfn(dax.pfn) & PG_PMD_COLOUR)) {
+ if (length < PMD_SIZE) {
+ dax_pmd_dbg(bdev, address, "dax-length too small");
+ dax_unmap_atomic(bdev, &dax);
+ goto fallback;
+ }
+ if (pfn_t_to_pfn(dax.pfn) & PG_PMD_COLOUR) {
+ dax_pmd_dbg(bdev, address, "pfn unaligned");
dax_unmap_atomic(bdev, &dax);
goto fallback;
}
@@ -679,6 +712,7 @@ int __dax_pmd_fault(struct vm_area_struct *vma, unsigned long address,
*/
if (pfn_t_has_page(dax.pfn)) {
dax_unmap_atomic(bdev, &dax);
+ dax_pmd_dbg(bdev, address, "pfn not in memmap");
goto fallback;
}
@@ -691,6 +725,11 @@ int __dax_pmd_fault(struct vm_area_struct *vma, unsigned long address,
}
dax_unmap_atomic(bdev, &dax);
+ dev_dbg(part_to_dev(bdev->bd_part),
+ "%s: %s addr: %lx pfn: %lx sect: %llx\n",
+ __func__, current->comm, address,
+ pfn_t_to_pfn(dax.pfn),
+ (unsigned long long) dax.sector);
result |= vmf_insert_pfn_pmd(vma, address, pmd,
dax.pfn, write);
}
--
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