Re: Re: Re: [for-416 PATCH 1/3] bcache: writeback: collapse contiguous IO better

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From: Tang Junhui <tang.junhui@xxxxxxxxxx>

>>
>> More importantly,
>>> +    while (!kthread_should_stop() && next) {
>>> ...
>>> +            if (nk != 0 && !keys_contiguous(dc, keys[nk-1], next))
>>> +                break;
>>> +
>>> +            size += KEY_SIZE(&next->key);
>>> +            keys[nk++] = next;
>>> +        } while ((next = bch_keybuf_next(&dc->writeback_keys)));
>>
>> if the "next" key does not satisfy the contiguous condition, does this
>> key not write-back to the backend device?
>
>I believe the current code is correct--- it is not written back *this
>time* (since it is not contiguous), but will be written back the next
>time through the loop (next is not changed).
>
Oh, yes, that's right. I read the wrong while{} loop.


Thanks,
Tang





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