From: Vlastimil Babka <vbabka@suse.cz>
To: Daniel Vetter <daniel.vetter@ffwll.ch>,
DRI Development <dri-devel@lists.freedesktop.org>
Cc: Intel Graphics Development <intel-gfx@lists.freedesktop.org>,
"Paul E . McKenney" <paulmck@kernel.org>,
Christoph Lameter <cl@linux.com>,
Pekka Enberg <penberg@kernel.org>,
David Rientjes <rientjes@google.com>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
Andrew Morton <akpm@linux-foundation.org>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@kernel.org>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
Michel Lespinasse <walken@google.com>,
Waiman Long <longman@redhat.com>,
Thomas Gleixner <tglx@linutronix.de>,
Randy Dunlap <rdunlap@infradead.org>,
linux-mm@kvack.org, linux-fsdevel@vger.kernel.org,
Dave Chinner <david@fromorbit.com>, Qian Cai <cai@lca.pw>,
linux-xfs@vger.kernel.org,
Daniel Vetter <daniel.vetter@intel.com>
Subject: Re: [PATCH 04/65] mm: Extract might_alloc() debug check
Date: Fri, 23 Oct 2020 16:14:21 +0200 [thread overview]
Message-ID: <d4d7ecb9-1147-2965-a551-7647e755387d@suse.cz> (raw)
In-Reply-To: <20201023122216.2373294-4-daniel.vetter@ffwll.ch>
On 10/23/20 2:21 PM, Daniel Vetter wrote:
> Extracted from slab.h, which seems to have the most complete version
> including the correct might_sleep() check. Roll it out to slob.c.
>
> Motivated by a discussion with Paul about possibly changing call_rcu
> behaviour to allocate memory, but only roughly every 500th call.
>
> There are a lot fewer places in the kernel that care about whether
> allocating memory is allowed or not (due to deadlocks with reclaim
> code) than places that care whether sleeping is allowed. But debugging
> these also tends to be a lot harder, so nice descriptive checks could
> come in handy. I might have some use eventually for annotations in
> drivers/gpu.
>
> Note that unlike fs_reclaim_acquire/release gfpflags_allow_blocking
> does not consult the PF_MEMALLOC flags. But there is no flag
> equivalent for GFP_NOWAIT, hence this check can't go wrong due to
> memalloc_no*_save/restore contexts.
>
> Cc: Paul E. McKenney <paulmck@kernel.org>
> Cc: Christoph Lameter <cl@linux.com>
> Cc: Pekka Enberg <penberg@kernel.org>
> Cc: David Rientjes <rientjes@google.com>
> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Cc: Peter Zijlstra <peterz@infradead.org>
> Cc: Ingo Molnar <mingo@kernel.org>
> Cc: Vlastimil Babka <vbabka@suse.cz>
> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
> Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
> Cc: Michel Lespinasse <walken@google.com>
> Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
> Cc: Waiman Long <longman@redhat.com>
> Cc: Thomas Gleixner <tglx@linutronix.de>
> Cc: Randy Dunlap <rdunlap@infradead.org>
> Cc: linux-mm@kvack.org
> Cc: linux-fsdevel@vger.kernel.org
> Cc: Dave Chinner <david@fromorbit.com>
> Cc: Qian Cai <cai@lca.pw>
> Cc: linux-xfs@vger.kernel.org
> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Looks useful.
Acked-by: Vlastimil Babka <vbabka@suse.cz>
next prev parent reply other threads:[~2020-10-23 14:14 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20201021163242.1458885-1-daniel.vetter@ffwll.ch>
[not found] ` <20201023122216.2373294-1-daniel.vetter@ffwll.ch>
2020-10-23 12:21 ` [PATCH 03/65] mm: Track mmu notifiers in fs_reclaim_acquire/release Daniel Vetter
2020-10-27 18:51 ` Christoph Hellwig
2020-10-27 19:01 ` Daniel Vetter
2020-10-23 12:21 ` [PATCH 04/65] mm: Extract might_alloc() debug check Daniel Vetter
2020-10-23 14:14 ` Vlastimil Babka [this message]
2020-10-23 14:16 ` Matthew Wilcox
2020-10-23 14:37 ` Daniel Vetter
2020-10-23 14:45 ` Daniel Vetter
2020-10-23 20:53 ` Paul E. McKenney
2020-10-23 12:21 ` [PATCH 29/65] s390/pci: Remove races against pte updates Daniel Vetter
2020-10-23 12:26 ` Daniel Vetter
2020-10-23 12:21 ` [PATCH 30/65] drm/exynos: Stop using frame_vector helpers Daniel Vetter
2020-10-23 12:21 ` [PATCH 31/65] drm/exynos: Use FOLL_LONGTERM for g2d cmdlists Daniel Vetter
2020-10-23 12:21 ` [PATCH 32/65] misc/habana: Stop using frame_vector helpers Daniel Vetter
2020-10-23 12:21 ` [PATCH 33/65] misc/habana: Use FOLL_LONGTERM for userptr Daniel Vetter
2020-10-23 12:21 ` [PATCH 34/65] mm/frame-vector: Use FOLL_LONGTERM Daniel Vetter
2020-10-23 12:21 ` [PATCH 35/65] media: videobuf2: Move frame_vector into media subsystem Daniel Vetter
2020-10-23 12:21 ` [PATCH 36/65] mm: Close race in generic_access_phys Daniel Vetter
2020-10-23 12:21 ` [PATCH 37/65] mm: Add unsafe_follow_pfn Daniel Vetter
2020-10-23 12:21 ` [PATCH 38/65] media/videbuf1|2: Mark follow_pfn usage as unsafe Daniel Vetter
2020-10-23 12:21 ` [PATCH 39/65] vfio/type1: Mark follow_pfn " Daniel Vetter
2020-10-23 12:21 ` [PATCH 40/65] PCI: Obey iomem restrictions for procfs mmap Daniel Vetter
2020-10-23 12:21 ` [PATCH 41/65] /dev/mem: Only set filp->f_mapping Daniel Vetter
2020-10-23 12:21 ` [PATCH 42/65] resource: Move devmem revoke code to resource framework Daniel Vetter
2020-10-23 12:21 ` [PATCH 43/65] sysfs: Support zapping of binary attr mmaps Daniel Vetter
2020-10-23 12:21 ` [PATCH 44/65] PCI: Revoke mappings like devmem Daniel Vetter
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