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Re: [Qemu-devel] Any topics for today's MTTCG sync-up call?

From: alvise rigo
Subject: Re: [Qemu-devel] Any topics for today's MTTCG sync-up call?
Date: Mon, 23 May 2016 14:03:42 +0200

Hi Alex,

I finally solved the issue I had, the branch is working well as far as I
can say.
The work I will share, in addition to making the LL/SC work mttcg-aware,
extends the various TLB flushes calls with the query-based mechanism: the
requesting CPU queries the flushes to the target CPUs and wait them for

Sorry for the delay, I have been quite busy. I just need to polish some
commits, than (this week) I will share the branch.

Best regards,

On Mon, May 23, 2016 at 12:57 PM, Alex Bennée <address@hidden>

> Hi,
> It's been a while since the last sync-up call. Have we got any topics to
> discuss today?
> Sergey and I (with a little Paolo) have spent some of last week delving
> into the locking hierarchy w.r.t to tb_lock vs mmap_lock to see if there
> is any simplification to be had. I'm not sure if this is a topic
> conducive to a phone call instead of the mailing list but if others want
> to discuss it we can add it as an agenda item.
> We also have a new member of the team. Pranith has joined as a GSoC
> student. He'll be looking at memory ordering with his first pass at the
> problem looking to solve the store-after-load issues which do show up on
> ARM-on-x86 (see my testcase).
> Alvise, is there any help you need with the LL/SC stuff? The MTTCG aware
> version has been taking some time so would it be worth sharing the
> issues you have hit with the group?
> Emilio, is there anything you want to add? I've been following the QHT
> stuff which is a really positive addition which my v3 base patches is
> based upon (making the hot-path non lock contended). Do you have
> anything in the works above that?
> Cheers,
> --
> Alex Bennée

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