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* changed vfs_root_register's name because the _mount didn't add anything
* removed the old pointless vfs_backend_tryaccept calls from drivers
* because of that, i could remove the vfs_backend globals
* replaced the horrible BACKEND_KERN macro
* all vfs_backends are now stored on the heap
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I was reading from the buffer as if the WRAP flag was enabled, but it
actually isn't supported with a 64K buffer.
Besides, if it worked correctly, then the code for updating the ring
position would land in the wrong place, because it didn't take WARP
into account.
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Those had a lot of repeating code, but I'm not sure if this is the
right change. Well, apart from making pipe_joinqueue more consistent.
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~3x speedup in tests
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$ iostress 32 512 0 > /vtty # before
512 calls, 0 bytes. avg 121133
$ iostress 32 512 0 > /vtty # after
512 calls, 0 bytes. avg 103540
103540/121133 = ~85%
I think the tiny bit of added complexity is worth it here.
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