Merge branch 'master' of github.com:cirosantilli/linux-kernel-module-cheat

README.adoc

@@ -1199,11 +1199,9 @@ in which the boot appears to hang for a considerable time.
 
 === GEM5
 
-==== GEM5 Introduction
-
 GEM5 is a system simulator, much like QEMU: http://gem5.org/
 
-Vs QEMU:
+==== GEM5 vs QEMU
 
 * advantage: simulates a generic more realistic pipelined and optionally out of order CPU cycle by cycle, including a realistic DRAM memory access model with latencies, caches and page table manipulations. This allows us to:
 ** do much more realistic performance benchmarking with it, which makes absolutely no sense in QEMU, which is purely functional
@@ -1220,6 +1218,11 @@ Instead, we have only chip makers, who keep everything that really works closed,
 +
 ** the documentation is more scarce
 ** it takes longer to support new hardware features
+* not sure: GEM5 has BSD license while QEMU has GPL
++
+This suits chip makers that want to distribute forks with secret IP to their customers.
++
+On the other hand, the chip makers tend to upstream less, and the project becomes more crappy in average :-)
 
 ==== GEM5 ARM
 
@@ -1348,7 +1351,7 @@ I have also tried to copy the exact same kernel command line options used by QEM
 
 ===== GEM5 checkpoint
 
-Analogous to QEMU's <<snapshot>>.
+Analogous to QEMU's <<snapshot>>, but better since it can be started from inside the guest, so we can easily checkpoint after a specific guest event, e.g. just before `init` is done.
 
 Documentation: http://gem5.org/Checkpoints