Searched hist:d408db99ed4c976d2cf52cfd394f8ef93073a8bc (Results 1 – 2 of 2) sorted by relevance
| /optee_os/lib/libutils/ext/ftrace/ |
| H A D | ftrace.c | d408db99ed4c976d2cf52cfd394f8ef93073a8bc Wed Feb 12 09:29:13 UTC 2020 Jerome Forissier <jerome@forissier.org> ftrace: introduce CFG_FTRACE_BUF_WHEN_FULL
Function tracing can become extremely slow in case a big buffer size is
used (say, CFG_FTRACE_BUF_SIZE=6000000 instead of the default 2048
bytes). This is because of the "shifting" algorithm used when the buffer
is full, which copies almost the full buffer before inserting a new
line.
In order to mitigate this problem, this patch introduces two new
methods to handle the buffer full condition:
1. Discard existing data and write new lines to the beginning of the
buffer.
2. Stop adding new lines.
The method can be selected at build time with CFG_FTRACE_BUF_WHEN_FULL.
Supported values are "shift", "wrap" and "stop".
Signed-off-by: Jerome Forissier <jerome@forissier.org>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
|
| /optee_os/mk/ |
| H A D | config.mk | d408db99ed4c976d2cf52cfd394f8ef93073a8bc Wed Feb 12 09:29:13 UTC 2020 Jerome Forissier <jerome@forissier.org> ftrace: introduce CFG_FTRACE_BUF_WHEN_FULL
Function tracing can become extremely slow in case a big buffer size is
used (say, CFG_FTRACE_BUF_SIZE=6000000 instead of the default 2048
bytes). This is because of the "shifting" algorithm used when the buffer
is full, which copies almost the full buffer before inserting a new
line.
In order to mitigate this problem, this patch introduces two new
methods to handle the buffer full condition:
1. Discard existing data and write new lines to the beginning of the
buffer.
2. Stop adding new lines.
The method can be selected at build time with CFG_FTRACE_BUF_WHEN_FULL.
Supported values are "shift", "wrap" and "stop".
Signed-off-by: Jerome Forissier <jerome@forissier.org>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
|