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configure: add --with-lg-slab-maxregs configure option.

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Specify the maximum number of regions in a slab, which is
(<lg-page> - <lg-tiny-min>) by default. This increases the limit of slab sizes
specified by "slab_sizes" in malloc_conf. This should never be less than
the default value. The max value of this option is related to LG_BITMAP_MAXBITS
(see more in bitmap.h).

For example, on a 4k page size system, if we:
  1) configure jemalloc with with --with-lg-slab-maxregs=12.
  2) export MALLOC_CONF="slab_sizes:9-16:4"
The slab size of 16 bytes is set to 4 pages. Previously, the default
lg-slab-maxregs is 9 (i.e. 12 - 3). The max slab size of 16 bytes is 2 pages
(i.e. (1<<9) * 16 bytes). By increasing the value from 9 to 12, the max slab
size can be set by MALLOC_CONF is 16 pages (i.e. (1<<12) * 16 bytes).
This commit is contained in:
Hao Liu
2020-09-09 12:21:41 +08:00
committed by David Goldblatt
parent d243b4ec48
commit 1541ffc765
4 changed files with 27 additions and 2 deletions
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7
INSTALL.md
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@@ -250,6 +250,13 @@ any of the following arguments (not a definitive list) to 'configure':
configuration, jemalloc will provide additional size classes that are not
16-byte-aligned (24, 40, and 56).
* `--with-lg-slab-maxregs=<lg-slab-maxregs>`
Specify the maximum number of regions in a slab, which is
(<lg-page> - <lg-tiny-min>) by default. This increases the limit of slab
sizes specified by "slab_sizes" in malloc_conf. This should never be less
than the default value.
* `--with-lg-vaddr=<lg-vaddr>`
Specify the number of significant virtual address bits. By default, the