By the way, it's also possible the current max size of 1024 can be shrunk. That number's just been carried over from the very first version of Chrome for Android. I left it alone, assuming that you all had tuned it when setting it (these numbers don't come from desktop Chrome), but maybe it's wrong.

See https://cs.chromium.org/chromium/src/net/ssl/ssl_client_session_cache.h?rcl=0&l=30

(We'd want to watch metrics on resumption rate as the cache size varies, of course, to quantify the exact trade-off here.)

I don't understand why you say that these numbers come from Chrome for Android? I don't see any android-specific config getting set?

I am also pretty confident no one tuned this for the first release of Chrome for Android.

The current limits were added in https://codereview.chromium.org/89623002, I believe, by a member of the Chrome for Android team.  Linked bug mentions Android crashes.

So, I think these numbers are shared between desktop and mobile. There was a refactoring done by someone on the mobile team, but it was done to fix a crash through cleaner structure. I don't think any performance testing was done back then.

Question - I haven't figured out how to receive low memory notifications.

Do you have any examples available? Or is there a certain class that is in charge of this?

Take a look at base/memory/memory_pressure_listener.h

thank you!

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/90e6f5527236b01e687e65722b257e884fc7f1b6

commit 90e6f5527236b01e687e65722b257e884fc7f1b6
Author: maksim.sisov <maksim.sisov@intel.com>
Date: Mon Jul 11 07:12:35 2016

Clear SSLClientSessionCache on low memory notifications.

There are two cases when cache is flushed:

1) MEMORY_PRESSURE_LEVEL_MODERATE: flush expired sessions only.
2) MEMORY_PRESSURE_LEVEL_CRITICAL: flush everything.

BUG= 622069 

Review-Url: https://codereview.chromium.org/2131883002
Cr-Commit-Position: refs/heads/master@{#404609}

[modify] https://crrev.com/90e6f5527236b01e687e65722b257e884fc7f1b6/net/ssl/ssl_client_session_cache.cc
[modify] https://crrev.com/90e6f5527236b01e687e65722b257e884fc7f1b6/net/ssl/ssl_client_session_cache.h
[modify] https://crrev.com/90e6f5527236b01e687e65722b257e884fc7f1b6/net/ssl/ssl_client_session_cache_unittest.cc