similar to: [PATCH] xen-blk: persistent-grants fixes

This patch implements persistent grants for the xen-blk{front,back} mechanism. The effect of this change is to reduce the number of unmap operations performed, since they cause a (costly) TLB shootdown. This allows the I/O performance to scale better when a large number of VMs are performing I/O. Previously, the blkfront driver was supplied a bvec[] from the request queue. This was granted to

Moving grant ref handles from blkbk to pending_req will allow us to get rid of the shared blkbk structure. Signed-off-by: Roger Pau Monné <roger.pau@citrix.com> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: xen-devel@lists.xen.org --- drivers/block/xen-blkback/blkback.c | 16 ++++------------ 1 files changed, 4 insertions(+), 12 deletions(-) diff --git

refactoring balback Signed-off-by: Ronghui Duan <ronghui.duan@intel.com<mailto:ronghui.duan@intel.com>> diff --git a/drivers/block/xen-blkback/blkback.c b/drivers/block/xen-blkback/blkback.c index 73f196c..b4767f5 100644 --- a/drivers/block/xen-blkback/blkback.c +++ b/drivers/block/xen-blkback/blkback.c @@ -64,6 +64,11 @@ MODULE_PARM_DESC(reqs, "Number of blkback requests to

This patch is a significant performance improvement for the m2p_override: about 6% using the gntdev device. Each m2p_add/remove_override call issues a MULTI_grant_table_op and a __flush_tlb_single if kmap_op != NULL. Batching all the calls together is a great performance benefit because it means issuing one hypercall total rather than two hypercall per page. If paravirt_lazy_mode is set

add segring support in blkback Signed-off-by: Ronghui Duan <ronghui.duan@intel.com> diff --git a/drivers/block/xen-blkback/blkback.c b/drivers/block/xen-blkback/blkback.c index 45eda98..0bbc226 100644 --- a/drivers/block/xen-blkback/blkback.c +++ b/drivers/block/xen-blkback/blkback.c @@ -60,6 +60,10 @@ static int xen_blkif_reqs = 64; module_param_named(reqs, xen_blkif_reqs, int, 0);

Hello Roger Pau Monne, The patch 4d4f270f1880: "xen-blkback: move free persistent grants code" from Nov 16, 2012, leads to the following warning: drivers/block/xen-blkback/blkback.c:238 free_persistent_gnts() warn: 'persistent_gnt' was already freed. drivers/block/xen-blkback/blkback.c 232 pages[segs_to_unmap] = persistent_gnt->page; 233

Hello Roger Pau Monne, The patch 4d4f270f1880: "xen-blkback: move free persistent grants code" from Nov 16, 2012, leads to the following warning: drivers/block/xen-blkback/blkback.c:238 free_persistent_gnts() warn: 'persistent_gnt' was already freed. drivers/block/xen-blkback/blkback.c 232 pages[segs_to_unmap] = persistent_gnt->page; 233

Dear list, This is the V4 of the trim support for xen-blkfront/blkback, Now we move BLKIF_OP_TRIM to BLKIF_OP_DISCARD, and dropped all "trim" stuffs in the patches, and use "discard" instead. Also we updated the helpers of blkif_x86_{32|64}_request or we will meet problems using a non-native protocol. And this patch has been tested with both SSD and raw file, with SSD we will

Hi At line 1118 of src//lib-index/mail-index-map.c, inside the function mail_index_map_move_to_memory, there is: mail_index_map_copy_header(map, map); Valgrind is stating that "Source and destination overlap in memcpy". I'm wondering if this code is just coping the same memory over itself, or if it is doing something useful. Regards, Diego Liziero. --- 1104 void

Hello Roger Pau Monne, The patch 0a8704a51f38: "xen/blkback: Persistent grant maps for xen blk drivers" from Oct 24, 2012, leads to the following warning: drivers/block/xen-blkfront.c:807 blkif_free() warn: 'persistent_gnt' was already freed. 807 llist_for_each_entry(persistent_gnt, all_gnts, node) { 808

Hello Roger Pau Monne, The patch 0a8704a51f38: "xen/blkback: Persistent grant maps for xen blk drivers" from Oct 24, 2012, leads to the following warning: drivers/block/xen-blkfront.c:807 blkif_free() warn: 'persistent_gnt' was already freed. 807 llist_for_each_entry(persistent_gnt, all_gnts, node) { 808

Dear all, I have sent this problem earlier but maybe its not detail, here I try to write more detail. I hope anybody can help me to point out the problem. First of all I used Ubuntu 12.04 x64 both for domain0 and domainU with modification to run under xen hypervisor and work with remus. I follow and configured the remus with this notes

Serve an arbitrary map of regions of the underlying plugin. --- common-rules.mk | 1 + configure.ac | 1 + filters/map/Makefile.am | 61 +++ filters/map/map.c | 256 +++++++++ filters/map/maptype.c | 493 ++++++++++++++++++ filters/map/maptype.h

We already have the frame (pfn of the grant page) stored inside struct grant, so there's no need to keep an aditional list of mapped frames for a specific request. This reduces memory usage in blkfront. Signed-off-by: Roger Pau Monné <roger.pau@citrix.com> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: xen-devel@lists.xen.org --- drivers/block/xen-blkfront.c | 6 +-----

Timo, Output of gdb session on the core file attached. This one only produced the following syslog: IMAP(user): UIDs broken with partial sync in mbox file /var/mail/r/user with no assert. Setup: Solaris 9, gcc 4.0.1 for dovecot build. Jeff Earickson Colby College -------------- next part -------------- Script started on Thu Sep 08 10:05:53 2005 %gdb imap core.rtohara GNU gdb 6.3 Copyright

Patrick, there following patches fix xenpaging for me. Granttable handling is incomplete. If a page is gone, a GNTST_eagain should be returned to the caller to inidcate the hypercall has to be retried after a while, until the page is available again. Please review. Olaf _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com

This is a cherry pick of two patches that add support for guest paged out frames in the XCP 2.6.32 dom0 patch queue. First patch propagates the ENOENT returned by the hypervisor in the case of a paged out page, all the way up the call chain to the MMAPBATCH_V2 ioctl. The ioctl is mainly used to harvest those return values and retry. The second patch adds retry loops to all backend grant

Just installed the latest (Dec. 12) CVS version and one user keeps getting this assertion failure. Todd dovecot: Dec 13 15:53:01 Error: 29718 imap(username): mbox sync: UID inserted in the middle of mailbox /mailhome/new/o/h/username/mbox (4863 > 3417, seq=780, idx_msgs=1913) dovecot: Dec 13 15:53:06 Error: 29718 imap(username): file mail-index-transaction.c: line 129

This patch series proposes two new filters. * truncate: This can truncate, extend, round up or round down the size of a plugin/device. A typical usage is to fix the qemu problem that it can only handle devices which are a multiple of 512-bytes: nbdkit --filter=truncate random size=500 round-up=512 This will serve a virtual device with size 512 bytes. Reading from the last 12 bytes will

In blkback driver, after I/O requests are submitted to Dom-0 block I/O subsystem, blkback goes to ''sleep'' effectively without letting blkfront know about it (req_event isn''t set appropriately). Hence blkfront doesn''t notify blkback when it submits a new I/O thus delaying the ''dispatch'' of the new I/O to Dom-0 block I/O subsystem. The new I/O is