| Message ID | 20210623125458.450462-5-ma.mandourr@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | plugins: New TCG plugin for cache modelling | expand |
On Wed, Jun 23, 2021 at 2:55 PM Mahmoud Mandour <ma.mandourr@gmail.com> wrote: > Signed-off-by: Mahmoud Mandour <ma.mandourr@gmail.com> > --- > docs/devel/tcg-plugins.rst | 60 ++++++++++++++++++++++++++++++++++++++ > 1 file changed, 60 insertions(+) > > diff --git a/docs/devel/tcg-plugins.rst b/docs/devel/tcg-plugins.rst > index 18c6581d85..9d90110cbf 100644 > --- a/docs/devel/tcg-plugins.rst > +++ b/docs/devel/tcg-plugins.rst > @@ -319,3 +319,63 @@ the user to see what hardware is accessed how often. > It has a number of options: > off:0000001c, 1, 2 > off:00000020, 1, 2 > ... > + > +- contrib/plugins/cache > + > +Cache modelling plugin that measures the performance of a given cache > +configuration when a given working set is run:: > + > + ./qemu-x86_64 -plugin ./libcache.so -d plugin -D cache.log \ > + ./build/tests/tcg/x86_64-linux-user/float_convs > + > Oops that's a wrong command... Should've been ./x86_64-linux-user/qemu-x86_64 -plugin ./contrib/plugins/libcache.so -d plugin -D cache.log \ ./tests/tcg/x86_64-linux-user/float_convs If you find the patch suitable and can edit the command before queueing it, otherwise tell me if you want me to resend :) > + > +will report the following:: > + > + Data accesses: 996479, Misses: 507 > + Miss rate: 0.050879% > + > + Instruction accesses: 2641737, Misses: 18617 > + Miss rate: 0.704726% > + > + address, data misses, instruction > + 0x424f1e (_int_malloc), 109, movq %rax, 8(%rcx) > + 0x41f395 (_IO_default_xsputn), 49, movb %dl, (%rdi, %rax) > + 0x42584d (ptmalloc_init.part.0), 33, movaps %xmm0, (%rax) > + 0x454d48 (__tunables_init), 20, cmpb $0, (%r8) > + ... > + > + address, fetch misses, instruction > + 0x4160a0 (__vfprintf_internal), 744, movl $1, %ebx > + 0x41f0a0 (_IO_setb), 744, endbr64 > + 0x415882 (__vfprintf_internal), 744, movq %r12, %rdi > + 0x4268a0 (__malloc), 696, andq $0xfffffffffffffff0, %rax > + ... > + > +The plugin has a number of arguments, all of them are optional: > + > + * arg="limit=N" > + > + Print top N icache and dcache thrashing instructions along with their > + address, number of misses, and its disassembly. (default: 32) > + > + * arg="icachesize=N" > + * arg="iblksize=B" > + * arg="iassoc=A" > + > + Instruction cache configuration arguments. They specify the cache size, > block > + size, and associativity of the instruction cache, respectively. > + (default: N = 16384, B = 64, A = 8) > + > + * arg="dcachesize=N" > + * arg="dblksize=B" > + * arg="dassoc=A" > + > + Data cache configuration arguments. They specify the cache size, block > size, > + and associativity of the data cache, respectively. > + (default: N = 16384, B = 64, A = 8) > + > + * arg="evict=POLICY" > + > + Sets the eviction policy to POLICY. Available policies are: :code:`lru`, > + :code:`fifo`, and :code:`rand`. The plugin will use the specified > policy for > + both instruction and data caches. (default: POLICY = :code:`lru`) > -- > 2.25.1 > >
diff --git a/docs/devel/tcg-plugins.rst b/docs/devel/tcg-plugins.rst index 18c6581d85..9d90110cbf 100644 --- a/docs/devel/tcg-plugins.rst +++ b/docs/devel/tcg-plugins.rst @@ -319,3 +319,63 @@ the user to see what hardware is accessed how often. It has a number of options: off:0000001c, 1, 2 off:00000020, 1, 2 ... + +- contrib/plugins/cache + +Cache modelling plugin that measures the performance of a given cache +configuration when a given working set is run:: + + ./qemu-x86_64 -plugin ./libcache.so -d plugin -D cache.log \ + ./build/tests/tcg/x86_64-linux-user/float_convs + + +will report the following:: + + Data accesses: 996479, Misses: 507 + Miss rate: 0.050879% + + Instruction accesses: 2641737, Misses: 18617 + Miss rate: 0.704726% + + address, data misses, instruction + 0x424f1e (_int_malloc), 109, movq %rax, 8(%rcx) + 0x41f395 (_IO_default_xsputn), 49, movb %dl, (%rdi, %rax) + 0x42584d (ptmalloc_init.part.0), 33, movaps %xmm0, (%rax) + 0x454d48 (__tunables_init), 20, cmpb $0, (%r8) + ... + + address, fetch misses, instruction + 0x4160a0 (__vfprintf_internal), 744, movl $1, %ebx + 0x41f0a0 (_IO_setb), 744, endbr64 + 0x415882 (__vfprintf_internal), 744, movq %r12, %rdi + 0x4268a0 (__malloc), 696, andq $0xfffffffffffffff0, %rax + ... + +The plugin has a number of arguments, all of them are optional: + + * arg="limit=N" + + Print top N icache and dcache thrashing instructions along with their + address, number of misses, and its disassembly. (default: 32) + + * arg="icachesize=N" + * arg="iblksize=B" + * arg="iassoc=A" + + Instruction cache configuration arguments. They specify the cache size, block + size, and associativity of the instruction cache, respectively. + (default: N = 16384, B = 64, A = 8) + + * arg="dcachesize=N" + * arg="dblksize=B" + * arg="dassoc=A" + + Data cache configuration arguments. They specify the cache size, block size, + and associativity of the data cache, respectively. + (default: N = 16384, B = 64, A = 8) + + * arg="evict=POLICY" + + Sets the eviction policy to POLICY. Available policies are: :code:`lru`, + :code:`fifo`, and :code:`rand`. The plugin will use the specified policy for + both instruction and data caches. (default: POLICY = :code:`lru`)
Signed-off-by: Mahmoud Mandour <ma.mandourr@gmail.com> --- docs/devel/tcg-plugins.rst | 60 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 60 insertions(+)