https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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- v2.6.20-rc4
- v2.6.20-rc3
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Tip revision: 2a24ab628aa7b190be32f63dfb6d96f3fb61580a authored by Linus Torvalds on 25 May 2005, 03:31:20 UTC
Linux 2.6.12-rc5
Linux 2.6.12-rc5
Tip revision: 2a24ab6
kernel_threads.txt
KERNEL THREADS
Freezer
Upon entering a suspended state the system will freeze all
tasks. This is done by delivering pseudosignals. This affects
kernel threads, too. To successfully freeze a kernel thread
the thread has to check for the pseudosignal and enter the
refrigerator. Code to do this looks like this:
do {
hub_events();
wait_event_interruptible(khubd_wait, !list_empty(&hub_event_list));
if (current->flags & PF_FREEZE)
refrigerator(PF_FREEZE);
} while (!signal_pending(current));
from drivers/usb/core/hub.c::hub_thread()
The Unfreezable
Some kernel threads however, must not be frozen. The kernel must
be able to finish pending IO operations and later on be able to
write the memory image to disk. Kernel threads needed to do IO
must stay awake. Such threads must mark themselves unfreezable
like this:
/*
* This thread doesn't need any user-level access,
* so get rid of all our resources.
*/
daemonize("usb-storage");
current->flags |= PF_NOFREEZE;
from drivers/usb/storage/usb.c::usb_stor_control_thread()
Such drivers are themselves responsible for staying quiet during
the actual snapshotting.