The DAX means Direct Access for files，if the pages have cache,
the file is not direct access. But in normal condition,
we can not find the problem directly.
In our case, we use ext2 filesystem with dax on the reserved mem.
we mmap the file and write some things ,the file is not changed immediately.
this is the wrong place to change that attribute:
Do you mean
add
ext4_file_mmap/ext2_file_mmap
if (IS_DAX(file_inode(file))) {
vma->vm_ops = &ext4_dax_vm_ops;
vma->vm_flags |= VM_MIXEDMAP;
+ vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
} else {
like this ???
On 2016/1/12 20:51, Matthew Wilcox wrote:
On Tue, Jan 12, 2016 at 07:43:45PM +0800, chenjie6@xxxxxxxxxx wrote:
From: chenjie <chenjie6@xxxxxxxxxx>
We show the pte:
*pte=01600000159c8fd3
The page should be no_cache attr,it will be better.
I disagree. What data do you have to show that the WC attribute would
be better than WB?
Even if we agree to that, this is the wrong place to change that
attribute, so the patch is NAKed. But you need more than "it will
be better".
.
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