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authorRoss Zwisler <ross.zwisler@linux.intel.com>2017-05-08 16:00:07 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-05-08 17:15:16 -0700
commit678c9fd0430a1431bd9901c76f41e04fcb3eac87 (patch)
treef8e5572697a189cdcfcc432e5893d0248e1ac0e0 /fs/dax.c
parentc3ff68d7d1e6a24b7ad76d00ee583929858d4001 (diff)
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dax: add tracepoints to dax_load_hole()
Add tracepoints to dax_load_hole(), following the same logging conventions as the rest of DAX. Here is the logging generated by a PTE read from a hole: read-1075 [002] .... 62.362108: dax_pte_fault: dev 259:0 ino 0x1003 shared ALLOW_RETRY|KILLABLE|USER address 0x10480000 pgoff 0x280 read-1075 [002] .... 62.362140: dax_load_hole: dev 259:0 ino 0x1003 shared ALLOW_RETRY|KILLABLE|USER address 0x10480000 pgoff 0x280 NOPAGE read-1075 [002] .... 62.362141: dax_pte_fault_done: dev 259:0 ino 0x1003 shared ALLOW_RETRY|KILLABLE|USER address 0x10480000 pgoff 0x280 NOPAGE Link: http://lkml.kernel.org/r/20170221195116.13278-4-ross.zwisler@linux.intel.com Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com> Reviewed-by: Jan Kara <jack@suse.cz> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Matthew Wilcox <mawilcox@microsoft.com> Cc: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/dax.c')
-rw-r--r--fs/dax.c16
1 files changed, 11 insertions, 5 deletions
diff --git a/fs/dax.c b/fs/dax.c
index d10524ab7e55..36fafff2e82f 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -509,21 +509,25 @@ int dax_invalidate_mapping_entry_sync(struct address_space *mapping,
static int dax_load_hole(struct address_space *mapping, void **entry,
struct vm_fault *vmf)
{
+ struct inode *inode = mapping->host;
struct page *page;
int ret;
/* Hole page already exists? Return it... */
if (!radix_tree_exceptional_entry(*entry)) {
page = *entry;
- goto out;
+ goto finish_fault;
}
/* This will replace locked radix tree entry with a hole page */
page = find_or_create_page(mapping, vmf->pgoff,
vmf->gfp_mask | __GFP_ZERO);
- if (!page)
- return VM_FAULT_OOM;
- out:
+ if (!page) {
+ ret = VM_FAULT_OOM;
+ goto out;
+ }
+
+finish_fault:
vmf->page = page;
ret = finish_fault(vmf);
vmf->page = NULL;
@@ -531,8 +535,10 @@ static int dax_load_hole(struct address_space *mapping, void **entry,
if (!ret) {
/* Grab reference for PTE that is now referencing the page */
get_page(page);
- return VM_FAULT_NOPAGE;
+ ret = VM_FAULT_NOPAGE;
}
+out:
+ trace_dax_load_hole(inode, vmf, ret);
return ret;
}