From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx> Hi folks, This is an updated series for adding tag pre-allocation support of target fabric descriptor memory, utilizing Kent's latest in-flight per-cpu ida bits here: [PATCH v3] lib/idr.c rewrite, percpu ida/tag allocator http://marc.info/?l=linux-kernel&m=137308733526328&w=2 Patch #1 includes target-core setup of se_sess->sess_cmd_map + se_sess->sess_tag_pool resources at session creation time, using fabric independent code in transport_init_session_tags(). Patch #2 is the initial conversion of vhost-scsi fabric code to use per-cpu ida logic for obtaining a new tcm_vhost_cmd descriptor via vhost_scsi_get_tag() during vhost_work_fn_t->handle_kick() -> vhost_scsi_handle_vq() callback execution. And patch #3 is a vhost-scsi change that adds pre-allocation of per tcm_vhost_cmd descriptor scatterlist + user-space page pointer memory, that allows the last two fast-path allocations to be dropped from tcm_vhost_submission_work() -> vhost_scsi_map_to_sgl() fast-path execution. Please review as v3.12 material. Thanks! --nab Nicholas Bellinger (3): target: Add transport_init_session_tags using per-cpu ida vhost/scsi: Convert to per-cpu ida_alloc + ida_free command map vhost/scsi: Add pre-allocation for tv_cmd SGL + upages memory drivers/target/target_core_transport.c | 33 ++++++++ drivers/vhost/scsi.c | 130 ++++++++++++++++++++++++-------- include/target/target_core_base.h | 5 + include/target/target_core_fabric.h | 1 + 4 files changed, 137 insertions(+), 32 deletions(-) -- 1.7.2.5 _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
