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--- etc:users:research:io-scheduler [2015/08/25 08:22] – kkv
+++ etc:users:research:io-scheduler [2016/08/08 20:53] – ↷ Page moved from users:research:io-scheduler to etc:users:research:io-scheduler kel
@@ Line 1: / Line 1: @@
 == io scheduler ==
-{{tag> linux io scheduler}}
+{{tag>linux io-scheduler}}
+== Preliminary ==
+  * [[https://www.kernel.org/doc/htmldocs/kernel-api/API-generic-make-request.html| generic_make_request]]
+  * [[https://www.kernel.org/doc/htmldocs/kernel-api/API-submit-bio.html|submit_bio]]
+  * [[http://lxr.free-electrons.com/source/include/linux/blk_types.h#L46|bio]]
+  * [[http://lxr.free-electrons.com/source/include/linux/fs.h#L448|block_device]]
+  * [[http://lxr.free-electrons.com/source/include/linux/genhd.h#L165|gendisk]]
+  * [[https://www.kernel.org/doc/htmldocs/kernel-api/API-blk-init-queue.html|blk_init_queue]]
+   #iostat -xmt 1
+   #fio --runtime=300 --time_based --name=random-read --rw=randread --size=128m --directory=/opt/disk/
+{{users:research:iosched.png|}}
+  * gendisk->[request_queue]queue->[request_list]rq
+  * http://lxr.free-electrons.com/source/drivers/ide/ide-gd.c#L420
+== Вопросы ==
+  * Q: может ли один элеватор обслуживать несколько дисков?
+  * A: [[https://lwn.net/Articles/27055/ | One request queue can be shared across multiple physical drives]]
+  * Q: кто в каком порядке обрабатывает per-disk очереди?
+== Useful materials ==
+  * [[http://stackoverflow.com/questions/4141324/function-caller-in-linux-kernel|Print caller function]]
+== Links ==
+  * [[https://www.kernel.org/doc/htmldocs/kernel-api/index.html| Kernel API]]
+  * [[https://scaryreasoner.wordpress.com/2013/09/14/the-life-of-io-in-the-linux-kernel/ | IO top-bottom]]