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| author | Ilias Apalodimas <ilias.apalodimas@linaro.org> | 2023-02-18 01:21:30 +0300 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2023-02-21 20:15:39 +0300 |
| commit | 4d4266e3fd321fadb628ce02de641b129522c39c (patch) | |
| tree | 3a3b01a058c6b6deb48ef8f14630d1eae7bef589 /tools/testing/selftests/bpf/progs | |
| parent | a00da30c052f07d67da56efd6a4f1fc85956c979 (diff) | |
| download | linux-4d4266e3fd321fadb628ce02de641b129522c39c.tar.xz | |
page_pool: add a comment explaining the fragment counter usage
When reading the page_pool code the first impression is that keeping
two separate counters, one being the page refcnt and the other being
fragment pp_frag_count, is counter-intuitive.
However without that fragment counter we don't know when to reliably
destroy or sync the outstanding DMA mappings. So let's add a comment
explaining this part.
Reviewed-by: Alexander Duyck <alexanderduyck@fb.com>
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
Link: https://lore.kernel.org/r/20230217222130.85205-1-ilias.apalodimas@linaro.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'tools/testing/selftests/bpf/progs')
0 files changed, 0 insertions, 0 deletions