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| author | Jinlong Chen <nickyc975@zju.edu.cn> | 2022-11-22 22:21:23 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2022-11-23 06:47:46 -0700 |
| commit | ac1171bd2c7a3a32dfbdd3c347919fee32b745a1 (patch) | |
| tree | b79a6abca07ca1c90e18a576b7dfc5edffee557a /block/elevator.c | |
| parent | 93c68cc46a070775cc6675e3543dd909eb9f6c9e (diff) | |
| download | lwn-ac1171bd2c7a3a32dfbdd3c347919fee32b745a1.tar.gz lwn-ac1171bd2c7a3a32dfbdd3c347919fee32b745a1.zip | |
elevator: update the document of elevator_switch
We no longer support falling back to the old io scheduler if switching to
the new one fails. Update the document to indicate that.
Fixes: a1ce35fa4985 ("block: remove dead elevator code")
Signed-off-by: Jinlong Chen <nickyc975@zju.edu.cn>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/94250961689ba7d2e67a7d9e7995a11166fedb31.1669126766.git.nickyc975@zju.edu.cn
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/elevator.c')
| -rw-r--r-- | block/elevator.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/block/elevator.c b/block/elevator.c index a5bdc3b1e7e5..01aa9f38f22e 100644 --- a/block/elevator.c +++ b/block/elevator.c @@ -650,10 +650,10 @@ void elevator_init_mq(struct request_queue *q) } /* - * switch to new_e io scheduler. be careful not to introduce deadlocks - - * we don't free the old io scheduler, before we have allocated what we - * need for the new one. this way we have a chance of going back to the old - * one, if the new one fails init for some reason. + * Switch to new_e io scheduler. + * + * If switching fails, we are most likely running out of memory and not able + * to restore the old io scheduler, so leaving the io scheduler being none. */ int elevator_switch(struct request_queue *q, struct elevator_type *new_e) { |