Public bug reported:
Logging values in uprobes is very slow because any logging to a ring buffer
requires a kernel trap. uprobes already has a trampoline of dynamically
generated code mapped into user processes.
With PTWRITE we could generate PTWRITE instructions there that log data items
requested by the user in the uprobes configuration string.
In theory the same could be also done for kprobes, although it is less critical
there as kprobes already support fast software logging.
Target Kernel:4.11?
Target Release: 17.10
** Affects: firefox (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1685693
Title:
[Feature] GLK:Support generating PTWRITE in uprobes
Status in firefox package in Ubuntu:
New
Bug description:
Logging values in uprobes is very slow because any logging to a ring buffer
requires a kernel trap. uprobes already has a trampoline of dynamically
generated code mapped into user processes.
With PTWRITE we could generate PTWRITE instructions there that log data items
requested by the user in the uprobes configuration string.
In theory the same could be also done for kprobes, although it is less
critical there as kprobes already support fast software logging.
Target Kernel:4.11?
Target Release: 17.10
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https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1685693/+subscriptions
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