From: Breno Leitao Date: Fri, 11 Oct 2024 17:01:21 +0000 (-0700) Subject: elevator: do not request_module if elevator exists X-Git-Tag: v6.12-rc4~20^2~6 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=b4ff6e93bfd0093ce3ffc7322e89fbaa8300488f;p=thirdparty%2Fkernel%2Flinux.git elevator: do not request_module if elevator exists Whenever an I/O elevator is changed, the system attempts to load a module for the new elevator. This occurs regardless of whether the elevator is already loaded or built directly into the kernel. This behavior introduces unnecessary overhead and potential issues. This makes the operation slower, and more error-prone. For instance, making the problem fixed by [1] visible for users that doesn't even rely on modules being available through modules. Do not try to load the ioscheduler if it is already visible. This change brings two main benefits: it improves the performance of elevator changes, and it reduces the likelihood of errors occurring during this process. [1] Commit e3accac1a976 ("block: Fix elv_iosched_local_module handling of "none" scheduler") Fixes: 734e1a860312 ("block: Prevent deadlocks when switching elevators") Signed-off-by: Breno Leitao Link: https://lore.kernel.org/r/20241011170122.3880087-1-leitao@debian.org Signed-off-by: Jens Axboe --- diff --git a/block/elevator.c b/block/elevator.c index 60497e3b25b0d..eb624f8ae99df 100644 --- a/block/elevator.c +++ b/block/elevator.c @@ -709,13 +709,21 @@ int elv_iosched_load_module(struct gendisk *disk, const char *buf, size_t count) { char elevator_name[ELV_NAME_MAX]; + struct elevator_type *found; + const char *name; if (!elv_support_iosched(disk->queue)) return -EOPNOTSUPP; strscpy(elevator_name, buf, sizeof(elevator_name)); + name = strstrip(elevator_name); - request_module("%s-iosched", strstrip(elevator_name)); + spin_lock(&elv_list_lock); + found = __elevator_find(name); + spin_unlock(&elv_list_lock); + + if (!found) + request_module("%s-iosched", name); return 0; }