* Matthew Wilcox wi...@linux.intel.com wrote:
A paper at FAST2012
(http://static.usenix.org/events/fast12/tech/full_papers/Yang.pdf) pointed
out the performance overhead of taking interrupts for low-latency block
I/Os. The solution the author investigated was to spin waiting for each
I/O
The patch modifies some variables using the format '%*ph[CN]' and prints them
as a hexadecimal string with the separator ':' or ''.
Signed-off-by: Oleksandr Khoshaba oleksandr.khosh...@gmail.com
---
drivers/scsi/qla2xxx/qla_bsg.c |8 +---
drivers/scsi/qla2xxx/qla_gs.c | 82
This patch set introduces sg_pcopy_from_buffer() and sg_pcopy_to_buffer(),
which copy data between a linear buffer and an SG list.
The only difference between sg_pcopy_{from,to}_buffer() and
sg_copy_{from,to}_buffer() is an additional argument that specifies
the number of bytes to skip the SG
The only difference between sg_pcopy_{from,to}_buffer() and
sg_copy_{from,to}_buffer() is an additional argument that specifies
the number of bytes to skip the SG list before copying.
Signed-off-by: Akinobu Mita akinobu.m...@gmail.com
Cc: Tejun Heo t...@kernel.org
Cc: Imre Deak
This function is used to proceed page iterator to the next page if
necessary, and will be used to implement the variants of
sg_copy_{from,to}_buffer() later.
Signed-off-by: Akinobu Mita akinobu.m...@gmail.com
Acked-by: Tejun Heo t...@kernel.org
Cc: Tejun Heo t...@kernel.org
Cc: Imre Deak
Once stop_machine() is gone from the CPU offline path, we won't be able
to depend on disabling preemption to prevent CPUs from going offline
from under us.
Use the get/put_online_cpus_atomic() APIs to prevent CPUs from going
offline, while invoking from atomic context.
Cc: Robert Love
I did some more digging and came up with a partial
workaround:
After adding the line:
{ PCI_VDEVICE(JMICRON, 0x236f), board_ahci_ign_iferr },
(at line 301 of drivers/ata/ahci.c)
The the sata ports of my two cards get detected and lspci -k shows
they are using the ahci driver.
My guess is
Looks like the RAID Mode is the default one and
quirk_jmicron_ata() in drivers/pci/quirks.c is supposed
to deal with it by changing the PCI device configuration ...
this does not happen or does not have the desired
result (maybe this is caused by working in a pass-trough
environment?).
- Matthias
On Sun, Jun 23, 2013 at 12:09 AM, Ingo Molnar mi...@kernel.org wrote:
The spinning approach you add has the disadvantage of actively wasting CPU
time, which could be used to run other tasks. In general it's much better
to make sure the completion IRQs are rate-limited and just schedule. This
On Wed, Jun 19, 2013 at 12:15:53PM -0700, Joe Perches wrote:
Don't emit OOM warnings when k.alloc calls fail when
there there is a v.alloc immediately afterwards.
Signed-off-by: Joe Perches j...@perches.com
For fs/ext4/super.c:
Acked-by: Theodore Ts'o ty...@mit.edu
On 6/12/13 7:54 AM, Bart Van Assche wrote:
Since it is not allowed to invoke scsi_remove_host() with interrupts
disabled, avoid saving and restoring the interrupt state inside
scsi_remove_host(). This patch does not change the functionality of
the function scsi_remove_host().
Signed-off-by:
On 6/12/13 7:55 AM, Bart Van Assche wrote:
A SCSI LLD may start cleaning up host resources as soon as
scsi_remove_host() returns. These host resources may be needed by
the LLD in an implementation of one of the eh_* functions. So if
one of the eh_* functions is in progress when
On Sun, 2013-06-23 at 20:21 -0500, Mike Christie wrote:
On 6/12/13 7:57 AM, Bart Van Assche wrote:
A SCSI LLD may overwrite host_scribble in its queuecommand()
implementation. Several drivers need that field to process
requests and aborts correctly. Hence this field must be saved
by
On Wed, 2013-06-12 at 14:51 +0200, Bart Van Assche wrote:
Now that all scsi_request_fn() callers hold a reference on the
SCSI device that function is invoked for
What makes you think that this is a true statement? The usual caller is
the block layer, which doesn't really know anything about
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