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Improve comment for struct BufferDesc.

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Add a note that per-buffer I/O condition variables currently live
outside the BufferDesc struct.  Follow-up for commit d8725104.

Reported-by: Julien Rouhaud <rjuju123@gmail.com>
Discussion: https://postgr.es/m/20210311031118.hucytmrgwlktjxgq%40nol
This commit is contained in:
Thomas Munro
2021-03-11 15:58:05 +13:00
parent 2950ff32f3
commit 049d9b872d
1 changed files with 4 additions and 0 deletions
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4
src/include/storage/buf_internals.h
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@ -174,6 +174,10 @@ typedef struct buftag
* Be careful to avoid increasing the size of the struct when adding or * Be careful to avoid increasing the size of the struct when adding or
* reordering members. Keeping it below 64 bytes (the most common CPU * reordering members. Keeping it below 64 bytes (the most common CPU
* cache line size) is fairly important for performance. * cache line size) is fairly important for performance.
*
* Per-buffer I/O condition variables are currently kept outside this struct in
* a separate array. They could be moved in here and still fit within that
* limit on common systems, but for now that is not done.
*/ */
typedef struct BufferDesc typedef struct BufferDesc
{ {