[mojo-edk] Trim read buffer to keep its size down

[mojo-edk] Trim read buffer to keep its size down

Shrinks Channel's read buffer back down to the maximum
unused capacity any time its contents have been fully
discarded. This prevents us from permanently wasting
memory after a large IPC is transmitted.

Based on work detailed in issue 529940, the max unused
capacity has also been reduced from 256 kB down to
64 kB. In practice we rarely transmit messages larger
than this, so the performance impact of these extra
allocations should be negligible.

BUG=593731, 500019
R=amistry@chromium.org

Committed: https://crrev.com/3e0d30405b64ff0011aa347e9ecbe891e9e2ec66
Cr-Commit-Position: refs/heads/master@{#383862}

[Ken Rockot(use gerrit already), 2016-03-28 17:07:27]

Patchset #1 (id:1) has been deleted

[Anand Mistry (off Chromium), 2016-03-29 22:02:53]

The CQ bit was checked by amistry@chromium.org

[Anand Mistry (off Chromium), 2016-03-29 22:02:53]

lgtm

[commit-bot: I haz the power, 2016-03-29 22:03:20]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1835933002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1835933002/20001

[commit-bot: I haz the power, 2016-03-29 23:34:10]

Committed patchset #1 (id:20001)

[commit-bot: I haz the power, 2016-03-29 23:35:15]

Description was changed from

==========
[mojo-edk] Trim read buffer to keep its size down

Shrinks Channel's read buffer back down to the maximum
unused capacity any time its contents have been fully
discarded. This prevents us from permanently wasting
memory after a large IPC is transmitted.

Based on work detailed in issue 529940, the max unused
capacity has also been reduced from 256 kB down to
64 kB. In practice we rarely transmit messages larger
than this, so the performance impact of these extra
allocations should be negligible.

BUG=593731,500019
R=amistry@chromium.org
==========

to

==========
[mojo-edk] Trim read buffer to keep its size down

Shrinks Channel's read buffer back down to the maximum
unused capacity any time its contents have been fully
discarded. This prevents us from permanently wasting
memory after a large IPC is transmitted.

Based on work detailed in issue 529940, the max unused
capacity has also been reduced from 256 kB down to
64 kB. In practice we rarely transmit messages larger
than this, so the performance impact of these extra
allocations should be negligible.

BUG=593731,500019
R=amistry@chromium.org

Committed: https://crrev.com/3e0d30405b64ff0011aa347e9ecbe891e9e2ec66
Cr-Commit-Position: refs/heads/master@{#383862}
==========

[commit-bot: I haz the power, 2016-03-29 23:35:16]

Patchset 1 (id:??) landed as
https://crrev.com/3e0d30405b64ff0011aa347e9ecbe891e9e2ec66
Cr-Commit-Position: refs/heads/master@{#383862}