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authorBryan Brattlof <hello@bryanbrattlof.com>2020-07-15 16:15:46 -0400
committerBryan Brattlof <hello@bryanbrattlof.com>2020-07-15 16:15:46 -0400
commit3de97e1b57e2e4de1a73501bbe4992ebff580074 (patch)
treee9d2dff7b8f2a8c8a8b464c6e6abe280b26eba8f
parentc38be28ac40510ff224609e8f47209ca4ca62b8c (diff)
downloadeudyptula-challenge-3de97e1b57e2e4de1a73501bbe4992ebff580074.tar.gz
eudyptula-challenge-3de97e1b57e2e4de1a73501bbe4992ebff580074.tar.bz2
task 13: add task readme
-rw-r--r--readme.rst2
-rw-r--r--tasks/13/readme28
2 files changed, 30 insertions, 0 deletions
diff --git a/readme.rst b/readme.rst
index bf4fbbe..e98653c 100644
--- a/readme.rst
+++ b/readme.rst
@@ -36,3 +36,5 @@ Here are the links to each task's readme:
11. A Driver Patch: `task <https://git.bryanbrattlof.com/eudyptula-challenge/tree/tasks/11/readme>`__
12. Linked Lists in Kernel Space: `task <https://git.bryanbrattlof.com/eudyptula-challenge/tree/tasks/12/readme>`__
+
+13. Optimizing Linked Lists: `task <https://git.bryanbrattlof.com/eudyptula-challenge/tree/tasks/13/readme>`__
diff --git a/tasks/13/readme b/tasks/13/readme
new file mode 100644
index 0000000..829209a
--- /dev/null
+++ b/tasks/13/readme
@@ -0,0 +1,28 @@
+Task 13
+=======
+
+Weren't those lists fun to play with? You should get used to them, they
+are used all over the kernel in lots of different places.
+
+Now that we are allocating a structure that we want to use a lot of, we
+might want to start caring about the speed of the allocation, and not
+have to worry about the creation of those objects from the "general"
+memory pools of the kernel.
+
+This task is to take the code written in task 12, and cause all memory
+allocated from the 'struct identity' to come from a private slab cache
+just for the fun of it.
+
+Instead of using kmalloc() and kfree() in the module, use
+kmem_cache_alloc() and kmem_cache_free() instead. Of course this means
+you will have to initialize your memory cache properly when the module
+starts up. Don't forget to do that. You are free to name your memory
+cache whatever you wish, but it should show up in the /proc/slabinfo
+file.
+
+Don't send the full module for this task, only a patch with the diff
+from task 12 showing the lines changed. This means you will have to
+keep a copy of your 12 task results somewhere to make sure you don't
+overwrite them.
+
+Also show the output of /proc/slabinfo with your module loaded.