linux-kernel - Re: [PATCH v2][RESEND] perf, x86: Fix multi-segment problem of perf_event_intel

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Message-ID: <20150901113147.GA11161@gmail.com>
Date:	Tue, 1 Sep 2015 13:31:47 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Taku Izumi <izumi.taku@...fujitsu.com>,
	linux-kernel@...r.kernel.org, mingo@...hat.com, acme@...nel.org,
	hpa@...or.com, x86@...nel.org, jolsa@...hat.com
Subject: Re: [PATCH v2][RESEND] perf, x86: Fix multi-segment problem of
 perf_event_intel_uncore


* Peter Zijlstra <peterz@...radead.org> wrote:

> +struct __find_pci2phy(int segment)
> +{
> +	struct pci2phy_map *map;
> +
> +	lockdep_assert_held(&pci2phy_map_lock);
> +
> +	list_for_each_entry(map, &pci2phy_map_head, list) {
> +		if (map->segment == segment)
> +			return map;
> +	}
> +
> +	map = kmalloc(sizeof(struct pci2phy_map), GFP_ATOMIC);

I really don't think we should be adding new GFP_ATOMIC allocations whenever it 
can be avoided.

Thanks,

	Ingo
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