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Update implementation details docs re: PTRDIFF_MAX.

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Document that the maximum size class is limited by PTRDIFF_MAX, rather
than the full address space.  This reflects changes that were part of
0c516a00c4 (Make *allocx() size class
overflow behavior defined.).
This commit is contained in:
Jason Evans 2016-03-31 12:31:10 -07:00
parent a82070ef5f
commit b582d2ad94
1 changed files with 11 additions and 3 deletions
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14
doc/jemalloc.xml.in
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@ -540,8 +540,8 @@ for (i = 0; i < nbins; i++) {
are smaller than four times the page size, large size classes are smaller are smaller than four times the page size, large size classes are smaller
than the chunk size (see the <link than the chunk size (see the <link
linkend="opt.lg_chunk"><mallctl>opt.lg_chunk</mallctl></link> option), and linkend="opt.lg_chunk"><mallctl>opt.lg_chunk</mallctl></link> option), and
huge size classes extend from the chunk size up to one size class less than huge size classes extend from the chunk size up to the largest size class
the full address space size.</para> that does not exceed <constant>PTRDIFF_MAX</constant>.</para>
<para>Allocations are packed tightly together, which can be an issue for <para>Allocations are packed tightly together, which can be an issue for
multi-threaded applications. If you need to assure that allocations do not multi-threaded applications. If you need to assure that allocations do not
@ -659,7 +659,7 @@ for (i = 0; i < nbins; i++) {
<entry>[1280 KiB, 1536 KiB, 1792 KiB]</entry> <entry>[1280 KiB, 1536 KiB, 1792 KiB]</entry>
</row> </row>
<row> <row>
<entry morerows="6">Huge</entry> <entry morerows="8">Huge</entry>
<entry>256 KiB</entry> <entry>256 KiB</entry>
<entry>[2 MiB]</entry> <entry>[2 MiB]</entry>
</row> </row>
@ -687,6 +687,14 @@ for (i = 0; i < nbins; i++) {
<entry>...</entry> <entry>...</entry>
<entry>...</entry> <entry>...</entry>
</row> </row>
<row>
<entry>512 PiB</entry>
<entry>[2560 PiB, 3 EiB, 3584 PiB, 4 EiB]</entry>
</row>
<row>
<entry>1 EiB</entry>
<entry>[5 EiB, 6 EiB, 7 EiB]</entry>
</row>
</tbody> </tbody>
</tgroup> </tgroup>
</table> </table>