Add the ability to selectively instrument a subset of functions by dividing the functions into N logical groups and then selecting a group to cover. By selecting different groups over time you could cover the entire application incrementally with lower overhead than instrumenting the entire application at once.
Differential Revision: https://reviews.llvm.org/D87953
Summary:
This addresses http://llvm.org/PR36790.
The change Deprecates a number of functions and types in
`include/xray/xray_log_interface.h` to recommend using string-based
configuration of XRay through the __xray_log_init_mode(...) function. In
particular, this deprecates the following:
- `__xray_set_log_impl(...)` -- users should instead use the
`__xray_log_register_mode(...)` and `__xray_log_select_mode(...)` APIs.
- `__xray_log_init(...)` -- users should instead use the
`__xray_log_init_mode(...)` function, which also requires using the
`__xray_log_register_mode(...)` and `__xray_log_select_mode(...)`
functionality.
- `__xray::FDRLoggingOptions` -- in following patches, we'll be
migrating the FDR logging implementations (and tests) to use the
string-based configuration. In later stages we'll remove the
`__xray::FDRLoggingOptions` type, and ask users to migrate to using the
string-based configuration mechanism instead.
- `__xray::BasicLoggingOptions` -- same as `__xray::FDRLoggingOptions`,
we'll be removing this type later and instead rely exclusively on the
string-based configuration API.
We also update the documentation to reflect the new advice and remove
some of the deprecated notes.
Reviewers: eizan, kpw, echristo, pelikan
Reviewed By: kpw
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D46173
llvm-svn: 331503
Summary:
This change consolidates the always/never lists that may be provided to
clang to externally control which functions should be XRay instrumented
by imbuing attributes. The files follow the same format as defined in
https://clang.llvm.org/docs/SanitizerSpecialCaseList.html for the
sanitizer blacklist.
We also deprecate the existing `-fxray-instrument-always=` and
`-fxray-instrument-never=` flags, in favour of `-fxray-attr-list=`.
This fixes http://llvm.org/PR34721.
Reviewers: echristo, vlad.tsyrklevich, eugenis
Reviewed By: vlad.tsyrklevich
Subscribers: llvm-commits, cfe-commits
Differential Revision: https://reviews.llvm.org/D45357
llvm-svn: 329543
In an example like "clang -fxray-instrument .." the .. could be confused
with a literal .. (parent directory), which is used in commands like
"cmake -GNinja .."
llvm-svn: 327000
This change makes XRay print the log file output only when the verbosity
level is higher than 0. It reduces the log spam in the default case when
we want XRay running silently, except when there are actual
fatal/serious errors.
We also update the documentation to show how to get the information
after the change to the default behaviour.
llvm-svn: 320550
This marks certain flags in XRay as deprecated (in particular,
`xray_naive_log=` and `xray_fdr_log=`), and recommends the use of the
`xray_mode=` flag.
llvm-svn: 319763
We've recently changed the default for `xray_naive_log=` to be `false`
instead of `true` to make it more consistent with the FDR mode logging
implementation. This means we will now ask users to explicitly choose
which version of the XRay logging is being used.
llvm-svn: 319400
Summary:
Updated the XRayExample docs with instructions for using the llvm-xray stacks
command.
Reviewers: dberris
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D39106
llvm-svn: 316192
Summary:
Adding a new restructuredText file to document the trace format produced with
an FDR mode handler and read by llvm-xray toolset.
Fixed two problems in the documentation from differential review. One bad table
and a missing link in the toc.
Original commit was e97c5836a77db803fe53319c53f3bf8e8b26d2b7.
Reviewers: dberris, pelikan
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D36041
llvm-svn: 309891
Summary:
Adding a new restructuredText file to document the trace format produced with
an FDR mode handler and read by llvm-xray toolset.
Reviewers: dberris, pelikan
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D36041
llvm-svn: 309836
Summary:
Update the XRay docs to mention new subcomands to the llvm-xray tool,
and details on FDR mode logging. Also list down available libraries for
use part of the LLVM distribution.
Reviewers: rSerge, pelikan, echristo, timshen, sdardis, rengolin
Subscribers: mehdi_amini, llvm-commits
Differential Revision: https://reviews.llvm.org/D30395
llvm-svn: 296528
Summary:
We update the documentation to define what the requirements are for the
provided XRay log handler. This is to make it clear that the function
pointer provided must do internal synchronisation and that there are no
guarantees provided by XRay on when the function shall be invoked once
it has been installed as a log handler.
Reviewers: rSerge, rengolin
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D26651
llvm-svn: 287073
Summary:
This is the initial version of the documentation for how to use XRay as
it stands in LLVM, Clang, and compiler-rt. We leave some room for later
expansion mentioining what is work in progress and what could be
expected moving forward.
We also give a high level overview of future work that's both ongoing
and planned.
Reviewers: echristo, dblaikie, chandlerc
Subscribers: mehdi_amini, llvm-commits
Differential Revision: https://reviews.llvm.org/D26386
llvm-svn: 286319
