Commits on Mar 28, 2024

1. scx_flatcg: Keep cgroup rb nodes stashed …

   The flatcg scheduler uses a rb_node type - struct cgv_node - to keep
   track of vtime. On cgroup init, a cgv_node is created and stashed in a
   hashmap - cgv_node_stash - for later use. In cgroup_enqueued and
   try_pick_next_cgroup, the node is inserted into the rbtree, which
   required removing it from the stash before this patch's changes.
   
   This patch makes cgv_node refcounted, which allows keeping it in the
   stash for the entirety of the cgroup's lifetime. Unnecessary
   bpf_kptr_xchg's and other boilerplate can be removed as a result.
   
   Note that in addition to bpf_refcount patches, which have been upstream
   for quite some time, this change depends on a more recent series [0].
   
     [0]: https://lore.kernel.org/bpf/[email protected]/
   
   Signed-off-by: Dave Marchevsky <[email protected]>

   

   davemarchevsky authored and htejun committed Mar 28, 2024
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