| From: | Claudio Freire <klaussfreire(at)gmail(dot)com> |
|---|---|
| To: | Mel Gorman <mgorman(at)suse(dot)de> |
| Cc: | Jim Nasby <jim(at)nasby(dot)net>, Robert Haas <robertmhaas(at)gmail(dot)com>, Kevin Grittner <kgrittn(at)ymail(dot)com>, Josh Berkus <josh(at)agliodbs(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org>, Joshua Drake <jd(at)commandprompt(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Magnus Hagander <magnus(at)hagander(dot)net>, "lsf-pc(at)lists(dot)linux-foundation(dot)org" <lsf-pc(at)lists(dot)linux-foundation(dot)org> |
| Subject: | Re: Linux kernel impact on PostgreSQL performance |
| Date: | 2014-01-14 00:27:38 |
| Message-ID: | CAGTBQpakKH+LCPHS7tHWsgjT_rxHaxQ4thYx6ZiYpCJQQVtYgg@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Mon, Jan 13, 2014 at 7:36 PM, Mel Gorman <mgorman(at)suse(dot)de> wrote:
> That could be something we look at. There are cases buried deep in the
> VM where pages get shuffled to the end of the LRU and get tagged for
> reclaim as soon as possible. Maybe you need access to something like
> that via posix_fadvise to say "reclaim this page if you need memory but
> leave it resident if there is no memory pressure" or something similar.
> Not exactly sure what that interface would look like or offhand how it
> could be reliably implemented.
I don't see a reason not to make this behavior the default for WONTNEED.
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