From: Daniel Black <daniel@mariadb.org>
To: libc-alpha@sourceware.org
Subject: ld.so - text and .data application segments to huge pages
Date: Thu, 4 Feb 2021 18:58:34 +1100 [thread overview]
Message-ID: <CABVffEMvuFXUcZBcDs8GQM=CttHeZcV-=0nDJ022pH5KQy4Nzg@mail.gmail.com> (raw)
Hi,
I received this exceptionally large (slightly convoluted) patch to
MariaDB to move the .text and .data sections to huge pages in the
MariaDB issue https://jira.mariadb.org/browse/MDEV-24051.
The author Dmitriy Philimonov (Huawei) claimed great gains of "9% in
TPS speedup. iTLB && dTLB misses reduced in 38 times and 5 times
respectively. Latency becomes lower, the jitter in the TPS reduced
significantly", so it's definitely beneficial.
Obviously maintaining such a large loader work around in a userspace
application is going to be a burden on the skill set of developers we
have available.
How complex would it be for the glibc elf loader to use huge pages for
data segments on load? (extending _dl_map_segments with an environment
variable control like LD_HUGEPAGES I assume).
Is there any required kernel work to implement this feature?
Would such a concept be supported by the developer community here?
If so I'm happy to write up a feature request (https://sourceware.org/bugzilla).
Anyone off hand interested in writing it?
Cheers,
Daniel
MariaDB Foundation
next reply other threads:[~2021-02-04 7:58 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-04 7:58 Daniel Black [this message]
2021-02-04 10:28 ` Florian Weimer
2021-02-11 7:53 ` Daniel Black
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