Re: [grpc-io] gRPC core: why polling_island has a field "merged_to"

[Wankai Zhang]

Thanks, @Sree, it's very helpful.

在 2016年10月19日星期三 UTC+8上午5:50:01，Sree Kuchibhotla写道：
>
> Hi Wankai,
>
> The following design document explains the rationale behind the new epoll 
> implementation. Polling island was added as a part of this change.
> https://github.com/grpc/grpc/blob/master/doc/epoll-polling-engine.md
> (see section 4).
>
> Here is some high level summary:
> - Polling island represents the underlying epoll set containing the file 
> descriptors (which is why it contains the epoll-fd)
> - The main idea in having them is to prevent a file descriptor from being 
> in multiple epoll sets. This means that whenever we add a file descriptor 
> (that already belongs to an epoll set) to another epoll set,  we merge the 
> underlying polling islands and old polling island's merged_to field points 
> to the new polling island..
>
> the document's section 4 explains it all
>
> thanks,
> Sree
>
> On Tue, Oct 18, 2016 at 8:38 AM, Wankai Zhang  > wrote:
>
>>
>> Hello, all:
>> I am using c/c++.
>> I am confused of polling_island data structure. Why it contains a field 
>> "merged_to" ? 
>> Could anyone help me?
>>
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>

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Re: [grpc-io] gRPC core: why polling_island has a field "merged_to"

['Sree Kuchibhotla' via grpc.io]

Hi Wankai,

The following design document explains the rationale behind the new epoll
implementation. Polling island was added as a part of this change.
https://github.com/grpc/grpc/blob/master/doc/epoll-polling-engine.md
(see section 4).

Here is some high level summary:
- Polling island represents the underlying epoll set containing the file
descriptors (which is why it contains the epoll-fd)
- The main idea in having them is to prevent a file descriptor from being
in multiple epoll sets. This means that whenever we add a file descriptor
(that already belongs to an epoll set) to another epoll set,  we merge the
underlying polling islands and old polling island's merged_to field points
to the new polling island..

the document's section 4 explains it all

thanks,
Sree

On Tue, Oct 18, 2016 at 8:38 AM, Wankai Zhang 
wrote:

>
> Hello, all:
> I am using c/c++.
> I am confused of polling_island data structure. Why it contains a field
> "merged_to" ?
> Could anyone help me?
>
> --
> You received this message because you are subscribed to the Google Groups "
> grpc.io" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to grpc-io+unsubscr...@googlegroups.com.
> To post to this group, send email to grpc-io@googlegroups.com.
> Visit this group at https://groups.google.com/group/grpc-io.
> To view this discussion on the web visit https://groups.google.com/d/
> msgid/grpc-io/24a57321-0d44-407c-95c4-f4debd94055c%40googlegroups.com
> 
> .
> For more options, visit https://groups.google.com/d/optout.
>

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