| From: | David Rowley <dgrowleyml(at)gmail(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Tomas Vondra <tomas(dot)vondra(at)enterprisedb(dot)com>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, Robert Haas <robertmhaas(at)gmail(dot)com>, Yura Sokolov <y(dot)sokolov(at)postgrespro(dot)ru>, PostgreSQL Developers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: Reducing the chunk header sizes on all memory context types |
| Date: | 2022-08-30 02:31:47 |
| Message-ID: | CAApHDvp0gzQq_sK=kTbFRm+p-1sxcSv5xt_n6cBvm1GAiSDskg@mail.gmail.com |
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On Tue, 30 Aug 2022 at 13:55, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> I wonder if slab ought to artificially bump up such requests when
> MEMORY_CONTEXT_CHECKING is enabled, so there's room for a sentinel.
> I think it's okay for aset.c to not do that, because its power-of-2
> behavior means there usually is room for a sentinel; but slab's
> policy makes it much more likely that there won't be.
I think it's fairly likely that small allocations are a power of 2,
and I think most of our allocates are small, so I imagine that if we
didn't do that for aset.c, we'd miss out on most of the benefits.
David
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