- 14 Feb, 2023 37 commits
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Heinz Mauelshagen authored
Signed-off-by:
Heinz Mauelshagen <heinzm@redhat.com> Signed-off-by:
Mike Snitzer <snitzer@kernel.org>
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
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Heinz Mauelshagen authored
'GPL-2.0-only' is used instead of 'GPL-2.0' because SPDX has deprecated its use. Suggested-by:
John Wiele <jwiele@redhat.com> Signed-off-by:
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Mikulas Patocka authored
Device mapper sends an uevent when the device is suspended, using the function set_capacity_and_notify. However, this causes a race condition with udev. Udev skips scanning dm devices that are suspended. If we send an uevent while we are suspended, udev will be racing with device mapper resume code. If the device mapper resume code wins the race, udev will process the uevent after the device is resumed and it will properly scan the device. However, if udev wins the race, it will receive the uevent, find out that the dm device is suspended and skip scanning the device. This causes bugs such as systemd unmounting the device - see https://bugzilla.redhat.com/show_bug.cgi?id=2158628 This commit fixes this race. We replace the function set_capacity_and_notify with set_capacity, so that the uevent is not sent at this point. In do_resume, we detect if the capacity has changed and we pass a boolean variable need_resize_uevent to dm_kobject_uevent. dm_kobject_uevent adds "RESIZE=1" to the uevent if need_resize_uevent is set. Signed-off-by:
Mikulas Patocka <mpatocka@redhat.com> Tested-by:
Peter Rajnoha <prajnoha@redhat.com> Cc: stable@vger.kernel.org Signed-off-by:
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- 12 Feb, 2023 2 commits
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Benjamin Marzinski authored
If a DM device's table references itself, it will crash the kernel with an infinite recursion. Check for a self-reference in dm_get_device(). This is a quick check, but it won't catch more complicated circular references. Signed-off-by:
Benjamin Marzinski <bmarzins@redhat.com> Signed-off-by:
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Yu Zhe authored
Signed-off-by:
Yu Zhe <yuzhe@nfschina.com> Signed-off-by:
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- 02 Feb, 2023 1 commit
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Nathan Huckleberry authored
Setting WQ_UNBOUND increases scheduler latency on ARM64. This is likely due to the asymmetric architecture of ARM64 processors. I've been unable to reproduce the results that claim WQ_UNBOUND gives a performance boost on x86-64. This flag is causing performance issues for multiple subsystems within Android. Notably, the same slowdown exists for decompression with EROFS. | open-prebuilt-camera | WQ_UNBOUND | ~WQ_UNBOUND | |-----------------------|------------|---------------| | verity wait time (us) | 11746 | 119 (-98%) | | erofs wait time (us) | 357805 | 174205 (-51%) | | sha256 ramdisk random read | WQ_UNBOUND | ~WQ_UNBOUND | |----------------------------|-----------=---|-------------| | arm64 (accelerated) | bw=42.4MiB/s | bw=212MiB/s | | arm64 (generic) | bw=16.5MiB/s | bw=48MiB/s | | x86_64 (generic) | bw=233MiB/s | bw=230MiB/s | Using a alloc_workqueue() @max_active arg of num_online_cpus() only made sense with WQ_UNBOUND. Switch the @max_active arg to 0 (aka default, which is 256 per-cpu). Also, eliminate 'wq_flags' since it really doesn't serve a purpose. Cc: Sami Tolvanen <samitolvanen@google.com> Cc: Eric Biggers <ebiggers@kernel.org> Signed-off-by:
Nathan Huckleberry <nhuck@google.com> Reviewed-by:
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