Re: [linux-pm] Resume from Memory very slow on 2.6.37+

Jeff Chua
2011-01-19T01:20:34Z

On Wed, Jan 19, 2011 at 4:20 AM, Rafael J. Wysocki <rjw@sisk.pl> wrote:
> Please apply the appended patch (without the previous one) and post a dmesg
> log containing a suspend-resume cycle with the delay.  I wonder where exactly
> the delay occurs.
> +       pr_info("%s: synchronize_rcu()\n", __func__);
>        synchronize_rcu();
> +       pr_info("%s: iounmap(%p), physaddr: %llx, size: %u\n", __func__,
> +               map->virt, map->phys, map->size);

Rafael,

The 30 seconds is due to this ...

PM: Syncing filesystems ... done.
Freezing user space processes ... _memory: synchronize_rcu()
acpi_os_unmap_memory: iounmap(ffffc90001c22000), physaddr: bb398000, size: 4096
acpi_os_unmap_memory: synchronize_rcu()
acpi_os_unmap_memory: iounmap(ffffc90001c26000), physaddr: bb399000, size: 4096
acpi_os_unmap_memory: synchronize_rcu()
acpi_os_unmap_memory: iounmap(ffffc90001c2a000), physaddr: bb39a000, size: 4096
acpi_os_unmap_memory: synchronize_rcu()
acpi_os_unmap_memory: iounmap(ffffc90001c2e000), physaddr: bb39b000, size: 4096
<repeat till ...>
acpi_os_unmap_memory: iounmap(ffffc90003538000), physaddr: bb79d000, size: 4096
acpi_os_unmap_memory: synchronize_rcu()
acpi_os_unmap_memory: iounmap(ffffc9000353c000), physaddr: bb79e000, size: 4096
Restarting tasks ... done.

After this, I see my X windows.

Thanks,
Jeff
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