Re: [tip:perf/urgent] perf/x86/mbm: Implement RMID recycling
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- Subject: Re: [tip:perf/urgent] perf/x86/mbm: Implement RMID recycling
- From: Matt Fleming <matt@xxxxxxxxxxxxxxxxxxx>
- Date: Wed, 23 Mar 2016 20:59:06 +0000
- Cc: dsahern@xxxxxxxxx, namhyung@xxxxxxxxxx, mingo@xxxxxxxxxx, peterz@xxxxxxxxxxxxx, brgerst@xxxxxxxxx, bp@xxxxxxxxx, dvlasenk@xxxxxxxxxx, vincent.weaver@xxxxxxxxx, torvalds@xxxxxxxxxxxxxxxxxxxx, eranian@xxxxxxxxxx, tony.luck@xxxxxxxxx, tglx@xxxxxxxxxxxxx, alexander.shishkin@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, luto@xxxxxxxxxxxxxx, hpa@xxxxxxxxx, jolsa@xxxxxxxxxx, acme@xxxxxxxxxx, linux-tip-commits@xxxxxxxxxxxxxxx
- In-reply-to: <alpine.DEB.2.10.1603211116410.25124@vshiva-Udesk>
- User-agent: Mutt/1.5.24+41 (02bc14ed1569) (2015-08-30)
On Mon, 21 Mar, at 11:27:55AM, Vikas Shivappa wrote:
>
> The init_mbm_sample calls the update_sample to read the MSR in IPI .. Since
> the count is also in IPI , they should not trash each other ?
>
> Basically all the MSR read/writes are in high irql , except for the mbm
> overflow timer and read calls which holds an irqsave spinlock.
Good point! This should be fine.
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