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From: Mike Christie <michael.christie@oracle.com>
To: himanshu.madhani@oracle.com, linux-scsi@vger.kernel.org,
target-devel@vger.kernel.org
Subject: [RFC PATCH 0/7] target: fix up locking in IO paths
Date: Sun, 25 Oct 2020 18:03:11 -0500
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target: fix up locking in IO paths
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This patchset removes se_session sess_cmd_lock for every driver but tcm qla2xxx and moves the se_device execution lock to per CPU so we can run submissions from multiple CPUs without hammering on those locks. With the patches I'm seeing a 25% improvement in IOPs for small IO tests like: fio --filename=/dev/sdXYZ --direct=1 --rw=randrw --bs=4k \ --iodepth=128 --numjobs=16 I'm sending this as RFC, because the qla2xxx patches are not tested and I'm hoping we can maybe just remove the session locking/list from that driver since it's only used to lookup commands for aborts when a specific model is used. The following patches are made over Linus's tree. Some of Martin's branches are missing: commit 149415586243bd0ea729760fb6dd7b3c50601871 Author: Sudhakar Panneerselvam <sudhakar.panneerselvam@oracle.com> Date: Wed Sep 16 23:54:31 2020 +0000 scsi: target: Fix lun lookup for TARGET_SCF_LOOKUP_LUN_FROM_TAG case