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The data_src has many entries to express memory behaviors. Add each
term separately so that users can combine them for their purpose.
I didn't add prefix for the constants for simplicity as they are mostly
distinguishable but I had to use l1_miss and l2_hit for mem_dtlb since
mem_lvl has different values for the same names. Note that I decided
mem_lvl to be used as an alias of mem_lvlnum as it's deprecated now.
According to the comment in the UAPI header, users should use the mix of
mem_lvlnum, mem_remote and mem_snoop. Also the SNOOPX bits are
concatenated to mem_snoop for simplicity.
The following terms are used for data_src and the corresponding perf
sample data fields:
* mem_op : { load, store, pfetch, exec }
* mem_lvl: { l1, l2, l3, l4, cxl, io, any_cache, lfb, ram, pmem }
* mem_snoop: { none, hit, miss, hitm, fwd, peer }
* mem_remote: { remote }
* mem_lock: { locked }
* mem_dtlb { l1_hit, l1_miss, l2_hit, l2_miss, any_hit, any_miss, walk, fault }
* mem_blk { by_data, by_addr }
* mem_hops { hops0, hops1, hops2, hops3 }
We can now use a filter expression like below:
'mem_op == load, mem_lvl <= l2, mem_dtlb == l1_hit'
'mem_dtlb == l2_miss, mem_hops > hops1'
'mem_lvl == ram, mem_remote == 1'
Note that 'na' is shared among the terms as it has the same value except
for mem_lvl. I don't have a good idea to handle that for now.
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Hao Luo <haoluo@google.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: James Clark <james.clark@arm.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@amd.com>
Cc: Song Liu <song@kernel.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: bpf@vger.kernel.org
Link: https://lore.kernel.org/r/20230314234237.3008956-2-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.