From: Stephen Warren <swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
To: Hiroshi DOYU <hdoyu-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
Cc: iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org,
linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH 1/1] iommu/tegra: smmu: Fix unsleepable memory allocation
Date: Wed, 27 Jun 2012 10:59:48 -0600 [thread overview]
Message-ID: <4FEB3C04.6040606@wwwdotorg.org> (raw)
In-Reply-To: <1340790841-23349-1-git-send-email-hdoyu-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
On 06/27/2012 03:54 AM, Hiroshi DOYU wrote:
> allo_pdir() is called in smmu_iommu_domain_init() with spin_lock
> held. memory allocations in it have to be atomic/unsleepable.
Presumably this will cause allocation failures in situations with heavy
memory pressure, rather than triggering swapping. Is it normal for IOMMU
drivers to work that way? If so, I'm fine with it. Otherwise, can the
allocations be performed before the spinlock is taken?
next prev parent reply other threads:[~2012-06-27 16:59 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-26 18:15 tegra alloc_pdir Chris Wright
[not found] ` <20120626181555.GW15796-JyIX8gxvWYPr2PDY2+4mTGD2FQJk+8+b@public.gmane.org>
2012-06-27 9:46 ` Hiroshi Doyu
[not found] ` <20120627.124628.673793050413876363.hdoyu-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2012-06-27 9:54 ` [PATCH 1/1] iommu/tegra: smmu: Fix unsleepable memory allocation Hiroshi DOYU
[not found] ` <1340790841-23349-1-git-send-email-hdoyu-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2012-06-27 15:57 ` Chris Wright
2012-06-27 16:59 ` Stephen Warren [this message]
[not found] ` <4FEB3C04.6040606-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2012-06-28 10:42 ` Hiroshi Doyu
[not found] ` <20120628134202.2102f715496a3b980b43f3b0-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2012-06-28 10:51 ` [v2 1/1] iommu/tegra: smmu: Fix unsleepable memory allocation at alloc_pdir() Hiroshi DOYU
[not found] ` <1340880707-6934-1-git-send-email-hdoyu-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2012-06-28 16:57 ` Stephen Warren
[not found] ` <4FEC8CEE.1000401-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2012-06-28 18:35 ` Hiroshi Doyu
[not found] ` <20120628.213554.1189327754979133382.hdoyu-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2012-06-28 19:08 ` Stephen Warren
[not found] ` <4FECAB9C.9040809-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2012-06-28 19:19 ` Hiroshi Doyu
[not found] ` <20120628.221945.1306825810095951985.hdoyu-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2012-06-29 6:15 ` [v3 1/2] iommu/tegra: smmu: Remove unnecessary sanity check " Hiroshi DOYU
[not found] ` <1340950527-16482-1-git-send-email-hdoyu-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2012-06-29 6:15 ` [v3 2/2] iommu/tegra: smmu: Fix unsleepable memory allocation " Hiroshi DOYU
2012-06-29 15:34 ` [v3 1/2] iommu/tegra: smmu: Remove unnecessary sanity check " Stephen Warren
2012-07-02 9:57 ` [PATCH 1/1] iommu/tegra: smmu: Fix unsleepable memory allocation Joerg Roedel
[not found] ` <20120702095747.GB2558-5C7GfCeVMHo@public.gmane.org>
2012-07-02 10:13 ` Hiroshi Doyu
[not found] ` <20120702.131326.685361720133451299.hdoyu-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2012-07-02 10:19 ` Hiroshi Doyu
[not found] ` <20120702.131903.1053229523265080291.hdoyu-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2012-07-02 10:42 ` joerg.roedel-5C7GfCeVMHo
[not found] ` <20120702104231.GD2558-5C7GfCeVMHo@public.gmane.org>
2012-07-02 11:14 ` Hiroshi Doyu
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