file creation timing

DISCUSSION Dave Hansen 2 participants 2 messages Feb 2, 2005

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Dave Hansen

author

2005-02-02 20:53 UTC #0 lore raw

For memory hotplug, I register each of my memory kobjects, followed by their individual files. I'm seeing races where the hotplug scripts get the event for the main register before all of the control files are there.

        ret = register_memory(mem, section, NULL);
	mem_create_simple_file(mem, phys_index);
	mem_create_simple_file(mem, state);
	mem_create_simple_file(mem, phys_device);

The script sees the /sys/.../memory directory before it sees the "state" file. Is there a handy way around this other than sleeping in the script? Can I somehow delay that registration event?

-- Dave

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Kay Sievers

2005-02-02 21:13 UTC #1 lore raw

Quoted 5 lines · Dave Hansen

For memory hotplug, I register each of my memory kobjects, followed by their individual files. I'm seeing races where the hotplug scripts get the event for the main register before all of the control files are there.

Quoted 8 lines

        ret = register_memory(mem, section, NULL);
	mem_create_simple_file(mem, phys_index);
	mem_create_simple_file(mem, state);
	mem_create_simple_file(mem, phys_device);
The script sees the /sys/.../memory directory before it sees the "state" file. Is there a handy way around this other than sleeping in the script?

You may use udev to manage the hotplug events by setting /sbin/udevsend as the hotplug helper. It will wait until sysfs is populated.

Quoted 1 line

Can I somehow delay that registration event?

No, not today, not without doing crazy stuff.

Kay