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33c81a3a9c
This brings over some of the techniques from the old memprof design. Sysprof and memprof shared a lot of code, so it is pretty natural to bring back the same callgraph view based on memory allocations. This reuses the StackStash just like it did in memprof. While it would be nice to reuse some existing tools out there, the fit of memprof with sysprof is so naturally aligned, it's not really a big deal to bring back the LD_PRELOAD. The value really comes from seeing all this stuff together instead of multiple apps. There are plenty of things we can implement on top of this that we are not doing yet such as temporary allocations, cross-thread frees, graphing the heap, and graphing differences between the heap at to points in time. I'd like all of these things, given enough time to make them useful. This is still a bit slow though due to the global lock we take to access the writer. To improve the speed here we need to get rid of that lock and head towards a design that allows a thread to request a new writer from Sysprof and save it in TLS (to be destroyed when the thread exits).
44 lines
2.0 KiB
C
44 lines
2.0 KiB
C
/* Rax -- A radix tree implementation.
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*
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* Copyright (c) 2017, Salvatore Sanfilippo <antirez at gmail dot com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of Redis nor the names of its contributors may be used
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* to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/* Allocator selection.
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*
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* This file is used in order to change the Rax allocator at compile time.
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* Just define the following defines to what you want to use. Also add
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* the include of your alternate allocator if needed (not needed in order
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* to use the default libc allocator). */
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#ifndef RAX_ALLOC_H
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#define RAX_ALLOC_H
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#define rax_malloc malloc
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#define rax_realloc realloc
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#define rax_free free
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#endif
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