On 2/20/19 11:24 AM, Ira Weiny wrote:
On Sun, Feb 03, 2019 at 09:21:33PM -0800, john.hubb...@gmail.com wrote:
From: John Hubbard
[snip]
+ *
+ * Locking: the lockless algorithm described in
page_cache_gup_pin_speculative()
+ * and page_cache_gup_pin_speculative() provides safe operation for
On Sun, Feb 03, 2019 at 09:21:33PM -0800, john.hubb...@gmail.com wrote:
> From: John Hubbard
>
[snip]
>
> +/*
> + * GUP_PIN_COUNTING_BIAS, and the associated functions that use it, overload
> + * the page's refcount so that two separate items are tracked: the original
> page
> + * reference
On 2/4/19 10:19 AM, Matthew Wilcox wrote:
> On Sun, Feb 03, 2019 at 09:21:33PM -0800, john.hubb...@gmail.com wrote:
>> +/*
>> + * GUP_PIN_COUNTING_BIAS, and the associated functions that use it, overload
>> + * the page's refcount so that two separate items are tracked: the original
>> page
>> +
On Sun, Feb 03, 2019 at 09:21:33PM -0800, john.hubb...@gmail.com wrote:
> +/*
> + * GUP_PIN_COUNTING_BIAS, and the associated functions that use it, overload
> + * the page's refcount so that two separate items are tracked: the original
> page
> + * reference count, and also a new count of how
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