btrace: increase buffer size
Try to allocate as much buffer as we can for each thread with a maximum of 64KB. 2014-01-16 Markus Metzger <markus.t.metzger@intel.com> * common/linux-btrace.c (linux_enable_btrace): Enlarge buffer.
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@ -1,3 +1,7 @@
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2014-01-16 Markus Metzger <markus.t.metzger@intel.com>
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* common/linux-btrace.c (linux_enable_btrace): Enlarge buffer.
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2014-01-16 Markus Metzger <markus.t.metzger@intel.com>
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* btrace.c (ftrace_new_function): Start counting at one.
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@ -423,7 +423,7 @@ struct btrace_target_info *
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linux_enable_btrace (ptid_t ptid)
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{
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struct btrace_target_info *tinfo;
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int pid;
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int pid, pg;
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tinfo = xzalloc (sizeof (*tinfo));
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tinfo->ptid = ptid;
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@ -451,17 +451,22 @@ linux_enable_btrace (ptid_t ptid)
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if (tinfo->file < 0)
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goto err;
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/* We hard-code the trace buffer size.
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At some later time, we should make this configurable. */
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tinfo->size = 1;
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tinfo->buffer = mmap (NULL, perf_event_mmap_size (tinfo),
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PROT_READ, MAP_SHARED, tinfo->file, 0);
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if (tinfo->buffer == MAP_FAILED)
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goto err_file;
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/* We try to allocate as much buffer as we can get.
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We could allow the user to specify the size of the buffer, but then
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we'd leave this search for the maximum buffer size to him. */
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for (pg = 4; pg >= 0; --pg)
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{
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/* The number of pages we request needs to be a power of two. */
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tinfo->size = 1 << pg;
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tinfo->buffer = mmap (NULL, perf_event_mmap_size (tinfo),
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PROT_READ, MAP_SHARED, tinfo->file, 0);
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if (tinfo->buffer == MAP_FAILED)
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continue;
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return tinfo;
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return tinfo;
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}
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err_file:
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/* We were not able to allocate any buffer. */
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close (tinfo->file);
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err:
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