[Webkit-unassigned] [Bug 155255] MemoryPressureHandler doesn't work if cgroups aren't present in Linux

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=155255

Carlos Garcia Campos <cgarcia at igalia.com> changed:

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 Attachment #273833|0                           |1
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 Attachment #282544|                            |review?
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--- Comment #27 from Carlos Garcia Campos <cgarcia at igalia.com> ---
Created attachment 282544
  --> https://bugs.webkit.org/attachment.cgi?id=282544&action=review
Different approach

This is a different approach to the previous patch. If there' no other way than polling an parsing /proc/meminfo, let's try to minimize the problems. There's a memory pressure handler in every secondary process, not only the web process but also in the network and plugin processes. So, this patch does the polling in a thread in the UI process to ensure it's only one process waking up. It uses eventFD to notify the other processes about memory pressure. The poll interval is calculated depending on the memory usage in every moment, between 1 and 15 seconds, to try to wake up less often when memory usage is low. Also instead of using a fixed size in MB of free memory as a threshold, it uses a percentage of the memory used. Everything can be configured just modifying some global variables in case any of the values I set is not good enough. And finally instead of using the MemFree value from /proce/meminfo, it uses the MemAvailable value, that was added to the kernel in version 3.somethin

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