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From: Vasilis Dimitsas <vdimitsas@gmail.com>
Date: Wed, 12 Jul 2017 23:31:21 +0300
Message-ID: <CAE=wTWYU8F5KDrC9VSxrtckVZ2xmvxy8owxCkZUcY4KXEiz0Og@mail.gmail.com>
Subject: asynchronous readahead prefetcher operation
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Good evening,

I am currently working on a project which is related to the operation of
the linux readahead prefetcher. As a result, I am trying to understand its
operation. Having read thoroughly the relevant part in the kernel code, I
realize, from the comments, that part of the prefetching occurs
asynchronously. The problem is that I can not verify this from the code.

Even if you call page_cache_sync_readahead() or
page_cache_async_readahead(), then both will end up in ra_submit(), in
which, the operation is common for both cases.

So, please could you tell me at which point does the operation of
prefetching occurs asynchronously?

Thank you in advance,

Vasilis Dimitsas

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<div dir=3D"ltr">Good evening,<div><br></div><div>I am currently working on=
 a project which is related to the operation of the linux readahead prefetc=
her. As a result, I am trying to understand its operation. Having read thor=
oughly the relevant part in the kernel code, I realize, from the comments, =
that part of the prefetching occurs asynchronously. The problem is that I c=
an not verify this from the code.</div><div><br></div><div>Even if you call=
 page_cache_sync_readahead() or page_cache_async_readahead(), then both wil=
l end up in ra_submit(), in which, the operation is common for both cases.<=
/div><div><br></div><div>So, please could you tell me at which point does t=
he operation of prefetching occurs asynchronously?</div><div><br></div><div=
>Thank you in advance,</div><div><br></div><div>Vasilis Dimitsas =C2=A0</di=
v></div>

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