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| author | Thomas Munro <tmunro@postgresql.org> | 2023-07-04 15:16:34 +1200 |
|---|---|---|
| committer | Thomas Munro <tmunro@postgresql.org> | 2023-07-04 15:21:36 +1200 |
| commit | af8f9ec66bd19a920d02b4c0eb65b3dd6057d324 (patch) | |
| tree | b7a3dc5945cc2fa2bfeb7dc5b8e1e30d93c8550c /src/backend/jit/llvm/llvmjit.c | |
| parent | 12529028a4e55eb0500477d2589eec625466facf (diff) | |
| download | postgresql-af8f9ec66bd19a920d02b4c0eb65b3dd6057d324.tar.gz postgresql-af8f9ec66bd19a920d02b4c0eb65b3dd6057d324.zip | |
Re-bin segment when memory pages are freed.
It's OK to be lazy about re-binning memory segments when allocating,
because that can only leave segments in a bin that's too high. We'll
search higher bins if necessary while allocating next time, and
also eventually re-bin, so no memory can become unreachable that way.
However, when freeing memory, the largest contiguous range of free pages
might go up, so we should re-bin eagerly to make sure we don't leave the
segment in a bin that is too low for get_best_segment() to find.
The re-binning code is moved into a function of its own, so it can be
called whenever free pages are returned to the segment's free page map.
Back-patch to all supported releases.
Author: Dongming Liu <ldming101@gmail.com>
Reviewed-by: Robert Haas <robertmhaas@gmail.com> (earlier version)
Reviewed-by: Thomas Munro <thomas.munro@gmail.com>
Discussion: https://postgr.es/m/CAL1p7e8LzB2LSeAXo2pXCW4%2BRya9s0sJ3G_ReKOU%3DAjSUWjHWQ%40mail.gmail.com
Diffstat (limited to 'src/backend/jit/llvm/llvmjit.c')
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