Summary of the analysis revised
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Carsten Grohmann
parent
470e5acf55
commit
72163cc7bc
@ -387,20 +387,13 @@ window.onerror = function (msg, url, lineNo, columnNo, errorObj) {
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The OOM killer calculates a score for each process and terminates the process with the highest score
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to satisfy the original memory request.
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</p>
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<p>
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The process "<span class="trigger_proc_name"></span>" (PID <span
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class="trigger_proc_pid"></span>)
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requested <span class="trigger_proc_requested_memory_pages_kb"></span>
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(<span class="trigger_proc_requested_memory_pages"></span>) memory
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from the <span class="trigger_proc_mem_zone"></span> memory zone.
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</p>
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</div>
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<div class="js-text--default-show js-oom-manual--show">
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<p>
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The OOM killer was manually triggered (e.g. with "<code>echo f > /proc/sysrq-trigger</code>")
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by a user with root privileges.
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There is no demand to free memory but the OOM killer started nevertheless.
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The OOM killer calculates a score for each process and terminates the process with the highest score.
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by a user with root privileges. There is no demand to free memory but the OOM killer started
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nevertheless. The OOM killer calculates a score for each process and terminates the process with the
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highest score.
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</p>
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</div>
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<div class="js-text--default-show js-swap-active--show">
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@ -421,22 +414,21 @@ window.onerror = function (msg, url, lineNo, columnNo, errorObj) {
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physical memory are in use.
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</p>
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</div>
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<p>
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The process "<span class="killed_proc_name"></span>"
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(PID <span class="killed_proc_pid"></span>)
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<span class="js-text--default-show js-killed-proc-score--show">
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with an OOM score of <span class="killed_proc_score"></span>
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</span>
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has been terminated. It uses <span class="killed_proc_rss_percent"></span>
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(<span class="killed_proc_total_rss_kb"></span>) of the resident memory.
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</p>
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<div class="js-text--default-hide js-alloc-failure--show">
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<div class="js-text--default-show js-oom-automatic--show">
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<p>
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A memory chunk of order <span class="trigger_proc_order"></span> (
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<span class="trigger_proc_requested_memory_pages"></span> /
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<span class="trigger_proc_requested_memory_pages_kb"></span> ) has been requested from the
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The process "<span class="trigger_proc_name"></span>" (PID <span class="trigger_proc_pid"></span>)
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requested a memory chunk of order <span class="trigger_proc_order"></span> from the
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"<span class="trigger_proc_mem_zone"></span>" memory zone.
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That are 2<span class="text__superscript">order</span> pages ==
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2<span class="trigger_proc_order text__superscript"></span> pages ==
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<span class="trigger_proc_requested_memory_pages"></span>
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a <span class="page_size_kb"></span> ==
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<span class="trigger_proc_requested_memory_pages_kb"></span> memory.
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</p>
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</div>
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<div class="js-text--default-hide js-alloc-failure--show">
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<p>
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<span class="js-text--default-hide js-alloc-failure-below-low-watermark--show">
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The request failed because after its fulfillment the free memory would be below the memory
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low watermark.
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@ -448,13 +440,22 @@ window.onerror = function (msg, url, lineNo, columnNo, errorObj) {
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<span class="js-text--default-hide js-alloc-failure-unknown-reason-show">
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The request failed, but the reason is unknown.
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</span>
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This analysis result is an estimate because the kernel reduces the minimum watermark in some rare cases.
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The memory shortage triggers the OOM process.
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</p>
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</div>
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<div>
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<p class="js-text--default-hide js-memory-fragmentation--show">
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Memory fragmentation is common. It occurs due to dynamic memory allocation by the kernel as well as by
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all applications.
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<p>
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The process "<span class="killed_proc_name"></span>"
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(PID <span class="killed_proc_pid"></span>)
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<span class="js-text--default-show js-killed-proc-score--show">
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with an OOM score of <span class="killed_proc_score"></span>
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</span>
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has been terminated. It uses <span class="killed_proc_rss_percent"></span>
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(<span class="killed_proc_total_rss_kb"></span>) of the resident memory.
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</p>
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<div class="js-text--default-hide js-memory-fragmentation--show">
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<p>
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Dynamic memory allocation is used by both the kernel and all applications. This leads to memory
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fragmentation and is a common behavior.
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<span class="js-text--default-hide js-memory-heavy-fragmentation--show">
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The system memory is heavily fragmented, because all chunks with an order ≥
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<span class="kconfig.PAGE_ALLOC_COSTLY_ORDER"></span> are in use. Allocation of larger contiguous
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@ -505,18 +506,41 @@ window.onerror = function (msg, url, lineNo, columnNo, errorObj) {
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<td class="trigger_proc_nodemask text--align-right"></td>
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<td>Bit mask indicating the cores on which the process can run.</td>
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</tr>
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<tr class="js-oom-automatic--show">
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<td>Requested memory<br>(order)</td>
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<td>Requested memory: order</td>
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<td class="text--align-right">
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<span class="trigger_proc_requested_memory_pages"></span> (2<span class="trigger_proc_order text__superscript"></span>) pages /
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<span class="trigger_proc_requested_memory_pages_kb"></span>
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<span class="trigger_proc_order"></span>
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</td>
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<td>The kernel specifies the requested number of pages as exponent of power of two.
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<td>The kernel specifies the requested number of pages as an exponent of a power of two.</td>
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</tr>
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<tr>
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<td>Requested memory<br>(zone)</td>
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<tr class="js-oom-automatic--show">
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<td>Requested memory: number of pages</td>
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<td class="text--align-right">
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<span class="trigger_proc_requested_memory_pages"></span>
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(2<span class="trigger_proc_order text__superscript"></span> pages) a
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<span class="page_size_kb"></span> per page
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</td>
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<td>Requested memory in number of pages.</td>
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</tr>
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<tr class="js-oom-automatic--show">
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<td>Requested memory: size</td>
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<td class="text--align-right"><span class="trigger_proc_requested_memory_pages_kb"></span></td>
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<td>Requested memory in kBytes.</td>
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</tr>
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<tr class="js-oom-automatic--show">
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<td>Requested memory: zone</td>
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<td class="trigger_proc_mem_zone text--align-right"></td>
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<td>Memory zone from which the requested storage chunk should come from.
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<td>Memory zone from which the requested storage chunk should come.</td>
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</tr>
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<tr class="js-oom-automatic--show">
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<td>Requested memory: node</td>
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<td class="trigger_proc_numa_node text--align-right"></td>
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<td>
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First NUMA node with memory shortage watermark "<code>free</code>" <
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"<code>min</code>" in memory watermark information.
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<br>
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Assumption that this is the node where the OOM was triggered.
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</td>
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</tr>
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<tr>
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@ -1017,6 +1041,7 @@ window.onerror = function (msg, url, lineNo, columnNo, errorObj) {
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<li>Display missing memory chunks (buddyinfo) again</li>
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<li>Add analysis why the memory request failed</li>
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<li>Add check for heavy memory fragmentation</li>
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<li>Summary of the analysis revised</li>
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<li>...</li>
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</ol>
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