Since this is requested for the common branches and hence all BSPs (This is the right place for a patch like this) ... can you provide some extra context about how they were identified (and tested).
Similar to my earlier comment, these in theory should be nominated for -stable. Bruce In message: [linux-yocto][v5.10/standard/base && v5.10/standard/preempt-rt/base][PATCH 1/2] blk-mq: Introduce the BLK_MQ_F_NO_SCHED_BY_DEFAULT flag on 12/03/2024 Wentao Zhang wrote: > From: Bart Van Assche <bvanass...@acm.org> > > commit 90b7198001f23ea37d3b46dc631bdaa2357a20b1 upstream. > > elevator_get_default() uses the following algorithm to select an I/O > scheduler from inside add_disk(): > - In case of a single hardware queue or if sharing hardware queues across > multiple request queues (BLK_MQ_F_TAG_HCTX_SHARED), use mq-deadline. > - Otherwise, use 'none'. > > This is a good choice for most but not for all block drivers. Make it > possible to override the selection of mq-deadline with a new flag, > namely BLK_MQ_F_NO_SCHED_BY_DEFAULT. > > Cc: Christoph Hellwig <h...@lst.de> > Cc: Ming Lei <ming....@redhat.com> > Cc: Tetsuo Handa <penguin-ker...@i-love.sakura.ne.jp> > Cc: Martijn Coenen <m...@android.com> > Cc: Jaegeuk Kim <jaeg...@kernel.org> > Signed-off-by: Bart Van Assche <bvanass...@acm.org> > Link: https://lore.kernel.org/r/20210805174200.3250718-2-bvanass...@acm.org > Signed-off-by: Jens Axboe <ax...@kernel.dk> > Signed-off-by: Wentao Zhang <wentao.zh...@windriver.com> > --- > block/elevator.c | 3 +++ > include/linux/blk-mq.h | 6 ++++++ > 2 files changed, 9 insertions(+) > > diff --git a/block/elevator.c b/block/elevator.c > index 2f962662c32a..f762b2af1d2a 100644 > --- a/block/elevator.c > +++ b/block/elevator.c > @@ -622,6 +622,9 @@ static inline bool elv_support_iosched(struct > request_queue *q) > */ > static struct elevator_type *elevator_get_default(struct request_queue *q) > { > + if (q->tag_set && q->tag_set->flags & BLK_MQ_F_NO_SCHED_BY_DEFAULT) > + return NULL; > + > if (q->nr_hw_queues != 1) > return NULL; > > diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h > index f8ea27423d1d..39526279fbd3 100644 > --- a/include/linux/blk-mq.h > +++ b/include/linux/blk-mq.h > @@ -398,7 +398,13 @@ enum { > BLK_MQ_F_STACKING = 1 << 2, > BLK_MQ_F_TAG_HCTX_SHARED = 1 << 3, > BLK_MQ_F_BLOCKING = 1 << 5, > + /* Do not allow an I/O scheduler to be configured. */ > BLK_MQ_F_NO_SCHED = 1 << 6, > + /* > + * Select 'none' during queue registration in case of a single hwq > + * or shared hwqs instead of 'mq-deadline'. > + */ > + BLK_MQ_F_NO_SCHED_BY_DEFAULT = 1 << 7, > BLK_MQ_F_ALLOC_POLICY_START_BIT = 8, > BLK_MQ_F_ALLOC_POLICY_BITS = 1, > > -- > 2.31.1 >
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