None

【严重程度】 一般
【特性】 Memory/Memory reclamation
【重现类型】 有条件概率重现
</p><p><br></p><div class="ql-code-block-container" spellcheck="false"><div class="ql-code-block" data-language="plain">bugzilla号：189186</div><div class="ql-code-block" data-language="plain"><br></div><div class="ql-code-block" data-language="plain">分析内存回收流程发现，在get_scan_count()中,有一个判断条件是关于swap空间的判断，如下：</div><div class="ql-code-block" data-language="plain">```</div><div class="ql-code-block" data-language="plain">static void get_scan_count(struct lruvec *lruvec, struct scan_control *sc,</div><div class="ql-code-block" data-language="plain">                           unsigned long *nr)</div><div class="ql-code-block" data-language="plain">{</div><div class="ql-code-block" data-language="plain">        ...</div><div class="ql-code-block" data-language="plain">        /* If we have no swap space, do not bother scanning anon pages. */ </div><div class="ql-code-block" data-language="plain">        if (!sc-&gt;may_swap || mem_cgroup_get_nr_swap_pages(memcg) &lt;= 0) {</div><div class="ql-code-block" data-language="plain">                scan_balance = SCAN_FILE;</div><div class="ql-code-block" data-language="plain">                goto out;</div><div class="ql-code-block" data-language="plain">        }</div><div class="ql-code-block" data-language="plain">        ...</div><div class="ql-code-block" data-language="plain">}</div><div class="ql-code-block" data-language="plain">```</div><div class="ql-code-block" data-language="plain">当swap空间为空时，会跳过扫面匿名页，此时可能存在着swapcache在匿名页lru链表上无法释放，这些数据既占据着swap空间，还作为swapcache存在内存中，占据内存空间，所以导致总使用的内存超过预期，又无法回收，因此导致OOM发生。</div></div><p><br></p><p>
【影响评估及测试建议】 None
【对外部影响描述】 None

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