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charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::333; envelope-from=alex.bennee@linaro.org; helo=mail-wm1-x333.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @linaro.org) X-ZM-MESSAGEID: 1663778233383100001 Although the test plugins are fairly basic they are still useful for some things so we should document their existence. Signed-off-by: Alex Benn=C3=A9e --- docs/devel/tcg-plugins.rst | 137 +++++++++++++++++++++++++++++++++++-- 1 file changed, 133 insertions(+), 4 deletions(-) diff --git a/docs/devel/tcg-plugins.rst b/docs/devel/tcg-plugins.rst index 8b40b2a606..9740a70406 100644 --- a/docs/devel/tcg-plugins.rst +++ b/docs/devel/tcg-plugins.rst @@ -145,12 +145,141 @@ Example Plugins =20 There are a number of plugins included with QEMU and you are encouraged to contribute your own plugins plugins upstream. There is a -``contrib/plugins`` directory where they can go. +``contrib/plugins`` directory where they can go. There are also some +basic plugins that are used to test and exercise the API during the +``make check-tcg`` target in ``tests\plugins``. =20 -- tests/plugins +- tests/plugins/empty.c =20 -These are some basic plugins that are used to test and exercise the -API during the ``make check-tcg`` target. +Purely a test plugin for measuring the overhead of the plugins system +itself. Does no instrumentation. + +- tests/plugins/bb.c + +A very basic plugin which will measure execution in course terms as +each basic block is executed. By default the results are shown once +execution finishes:: + + $ qemu-aarch64 -plugin tests/plugin/libbb.so \ + -d plugin ./tests/tcg/aarch64-linux-user/sha1 + SHA1=3D15dd99a1991e0b3826fede3deffc1feba42278e6 + bb's: 2277338, insns: 158483046 + +Behaviour can be tweaked with the following arguments: + + * inline=3Dtrue|false + + Use faster inline addition of a single counter. Not per-cpu and not + thread safe. + + * idle=3Dtrue|false + + Dump the current execution stats whenever the guest vCPU idles + +- tests/plugins/insn.c + +This is a basic instruction level instrumentation which can count the +number of instructions executed on each core/thread:: + + $ qemu-aarch64 -plugin tests/plugin/libinsn.so \ + -d plugin ./tests/tcg/aarch64-linux-user/threadcount + Created 10 threads + Done + cpu 0 insns: 46765 + cpu 1 insns: 3694 + cpu 2 insns: 3694 + cpu 3 insns: 2994 + cpu 4 insns: 1497 + cpu 5 insns: 1497 + cpu 6 insns: 1497 + cpu 7 insns: 1497 + total insns: 63135 + +Behaviour can be tweaked with the following arguments: + + * inline=3Dtrue|false + + Use faster inline addition of a single counter. Not per-cpu and not + thread safe. + + * sizes=3Dtrue|false + + Give a summary of the instruction sizes for the execution + + * match=3D + + Only instrument instructions matching the string prefix. Will show + some basic stats including how many instructions have executed since + the last execution. For example:: + + $ qemu-aarch64 -plugin tests/plugin/libinsn.so,match=3Dbl \ + -d plugin ./tests/tcg/aarch64-linux-user/sha512-vector + ... + 0x40069c, 'bl #0x4002b0', 10 hits, 1093 match hits, =CE=94+1257 since l= ast match, 98 avg insns/match + 0x4006ac, 'bl #0x403690', 10 hits, 1094 match hits, =CE=94+47 since las= t match, 98 avg insns/match=20 + 0x4037fc, 'bl #0x4002b0', 18 hits, 1095 match hits, =CE=94+22 since las= t match, 98 avg insns/match=20 + 0x400720, 'bl #0x403690', 10 hits, 1096 match hits, =CE=94+58 since las= t match, 98 avg insns/match=20 + 0x4037fc, 'bl #0x4002b0', 19 hits, 1097 match hits, =CE=94+22 since las= t match, 98 avg insns/match=20 + 0x400730, 'bl #0x403690', 10 hits, 1098 match hits, =CE=94+33 since las= t match, 98 avg insns/match=20 + 0x4037ac, 'bl #0x4002b0', 12 hits, 1099 match hits, =CE=94+20 since las= t match, 98 avg insns/match=20 + ... + +For more detailed execution tracing see the ``execlog`` plugin for +other options. + +- tests/plugins/mem.c + +Basic instruction level memory instrumentation:: + + $ qemu-aarch64 -plugin tests/plugin/libmem.so,inline=3Dtrue \ + -d plugin ./tests/tcg/aarch64-linux-user/sha1 + SHA1=3D15dd99a1991e0b3826fede3deffc1feba42278e6 + inline mem accesses: 79525013 + +Behaviour can be tweaked with the following arguments: + + * inline=3Dtrue|false + + Use faster inline addition of a single counter. Not per-cpu and not + thread safe. + + * callback=3Dtrue|false + + Use callbacks on each memory instrumentation. + + * hwaddr=3Dtrue|false + + Count IO accesses (only for system emulation) + +- tests/plugins/syscall.c + +A basic syscall tracing plugin. This only works for user-mode. By +default it will give a summary of syscall stats at the end of the +run:: + + $ qemu-aarch64 -plugin tests/plugin/libsyscall \ + -d plugin ./tests/tcg/aarch64-linux-user/threadcount + Created 10 threads + Done + syscall no. calls errors + 226 12 0 + 99 11 11 + 115 11 0 + 222 11 0 + 93 10 0 + 220 10 0 + 233 10 0 + 215 8 0 + 214 4 0 + 134 2 0 + 64 2 0 + 96 1 0 + 94 1 0 + 80 1 0 + 261 1 0 + 78 1 0 + 160 1 0 + 135 1 0 =20 - contrib/plugins/hotblocks.c =20 --=20 2.34.1