On 2021/1/6 下午11:41, Jan Kara wrote:
On Thu 31-12-20 00:55:55, Shiyang Ruan wrote:
The current memory_failure_dev_pagemap() can only handle single-mapped
dax page for fsdax mode. The dax page could be mapped by multiple files
and offsets if we let reflink feature & fsdax mode work together.
Augment cxl-list with some more fields obtained from sending an
'Identify' command to the device. If/when these fields are added to the
sysfs representation of the memdev, the command submission detour can be
removed and replaced with data from sysfs.
Cc: Ben Widawsky
Cc: Dan Williams
Signed-off
Add APIs to access an incomplete list of fields from the 'Identify'
mailbox command. The fields added are fw_revision, partition_align, and
lsa_size.
Signed-off-by: Vishal Verma
---
cxl/lib/private.h | 19 +++
cxl/lib/libcxl.c | 44
Add a set of APIs around 'cxl_cmd' for querying the kernel for supported
commands, allocating and validating command structures against the
supported set, and submitting the commands.
'Query Commands' and 'Send Command' are implemented as IOCTLs in the
kernel. 'Query Commands' returns information
While CXL functionality is under development, it is useful to have a
local copy of the UAPI header for cxl_mem definitions. This allows
building cxl and libcxl on systems where the appropriate kernel headers
are not installed in the usual locations.
Cc: Ben Widawsky
Cc: Dan Williams
Signed-off-b
CXL - or Compute eXpress Link - is a new interconnect that extends PCIe
to support a wide range of devices, including cache coherent memory
expanders. As such, these devices can be new sources of 'persistent
memory', and the 'ndctl' umbrella of tools and libraries needs to be able
to interact with
This is an RFC patchset to add a new utility and library to support
CXL devices. This comprehends the kernel's sysfs layout for CXL
devices, and implements a command submission harness for CXL mailbox
commands via ioctl()s definied by the cxl_mem driver.
These patches include:
- libcxl representat
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On Mon, 11 Jan 2021, Matthew Wilcox wrote:
> On Sun, Jan 10, 2021 at 04:19:15PM -0500, Mikulas Patocka wrote:
> > I put counters into vfs_read and vfs_readv.
> >
> > After a fresh boot of the virtual machine, the counters show "13385 4".
> > After a kernel compilation they show "4475220 8".
>
From: Al Viro On Behalf Of Al Viro
> Sent: 11 January 2021 14:44
> On Mon, Jan 11, 2021 at 11:57:08AM +, David Laight wrote:
> > > > > size = copy_to_iter(to, ptr, size);
> > > > > if (unlikely(!size)) {
> > > > > r = -EFAULT;
> > > > >
On Mon, Jan 11, 2021 at 11:57:08AM +, David Laight wrote:
> > > > size = copy_to_iter(to, ptr, size);
> > > > if (unlikely(!size)) {
> > > > r = -EFAULT;
> > > > goto ret_r;
> > > > }
> > > >
> > > >
From: Mikulas Patocka
> Sent: 11 January 2021 11:44
> On Mon, 11 Jan 2021, David Laight wrote:
>
> > From: Al Viro On Behalf Of Al Viro
> > > Sent: 10 January 2021 16:20
...
...
> > > while (iov_iter_count(to)) {
...
> > > size = copy_to_iter(to, ptr, size);
> > > if (unlike
On Mon, 11 Jan 2021, David Laight wrote:
> From: Al Viro On Behalf Of Al Viro
> > Sent: 10 January 2021 16:20
> >
> > On Thu, Jan 07, 2021 at 08:15:41AM -0500, Mikulas Patocka wrote:
> > > Hi
> > >
> > > I announce a new version of NVFS - a filesystem for persistent memory.
> > > http://peo
On Sun, 10 Jan 2021, Al Viro wrote:
> On Sun, Jan 10, 2021 at 04:14:55PM -0500, Mikulas Patocka wrote:
>
> > That's a good point. I split nvfs_rw_iter to separate functions
> > nvfs_read_iter and nvfs_write_iter - and inlined nvfs_rw_iter_locked into
> > both of them. It improved performance
From: Al Viro On Behalf Of Al Viro
> Sent: 10 January 2021 16:20
>
> On Thu, Jan 07, 2021 at 08:15:41AM -0500, Mikulas Patocka wrote:
> > Hi
> >
> > I announce a new version of NVFS - a filesystem for persistent memory.
> > http://people.redhat.com/~mpatocka/nvfs/
> Utilities, AFAICS
>
> >
From: Matthew Wilcox
> Sent: 10 January 2021 06:13
...
> nvfs_rw_iter_locked() looks very complicated. I suspect it can
> be simplified. Of course new_sync_read() needs to be improved too,
> as do the other functions here, but fully a third of the difference
> between read() and read_iter() is th
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