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Merlijn Wajer authored
When replacing the Big Kernel Lock in commit 2a48fc0a ("block: autoconvert trivial BKL users to private mutex"), the lock was replaced with a sr-wide lock. This causes very poor performance when using multiple sr devices, as the sr driver was not able to execute more than one command to one drive at any given time, even when there were many CD drives available. Replace the global mutex with per-sr-device mutex. Someone tried this patch at the time, but it never made it upstream, due to possible concerns with race conditions, but it's not clear the patch actually caused those: https://www.spinics.net/lists/linux-scsi/msg63706.html https://www.spinics.net/lists/linux-scsi/msg63750.html Also see http://lists.xiph.org/pipermail/paranoia/2019-December/001647.html Link: https://lore.kernel.org/r/20200218143918.30267-1-merlijn@archive.org Acked-by:
Arnd Bergmann <arnd@arndb.de> Signed-off-by:
Merlijn Wajer <merlijn@archive.org> Signed-off-by:
Martin K. Petersen <martin.petersen@oracle.com>
51a85881
