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ridethepig 2023-05-04 15:43:21 +08:00
parent 47053d35da
commit 3af49699a4
6 changed files with 2048 additions and 10 deletions
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475
assets/HTMFS_Strong_Consistency_Comes_for_Free_with_1682647018871_0.edn
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@ -493,5 +493,478 @@
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3
journals/2023_05_04.md Normal file
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@ -0,0 +1,3 @@
- TODO Paper1-HTMFS Implementation 看完
- TODO 模式识别作业提交
- TODO 写一会编译器

7
logseq/bak/logseq/custom/2023-04-30T03_42_43.088Z.Desktop.css → logseq/bak/logseq/custom/2023-05-04T04_57_33.197Z.Desktop.css
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@ -317,13 +317,14 @@ mark {
font-size: inherit; font-size: inherit;
text-decoration-style: solid; text-decoration-style: solid;
text-decoration: underline; text-decoration: underline;
text-decoration-color: var(--ls-primary-background-color); text-decoration-color: rgba(255,198,0,0.7);
text-decoration-thickness: 4px; text-decoration-thickness: 4px;
text-underline-offset: -1px; text-underline-offset: -1px;
text-decoration-skip-ink: none; text-decoration-skip-ink: none;
} }
html[data-theme="dark"] mark {
text-decoration-color: rgba(255,198,0,0.7);
}
/* fix color page-reference when mark text */ /* fix color page-reference when mark text */
mark .page-ref, mark .page-ref,
mark .page-reference .bracket { mark .page-reference .bracket {

1448
logseq/bak/pages/hls__Computer_Organization_and_Design_1681729306797_0/2023-05-04T04_18_30.202Z.Desktop.md Normal file
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10
logseq/custom.css
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@ -113,8 +113,8 @@ html[data-theme="light"],
/* {{ 1.2. Layout corrections */ /* {{ 1.2. Layout corrections */
/* Helps to not overlap content with tabs plugin */ /* Helps to not overlap content with tabs plugin */
#main-content-container { #main-content-container {
margin-top: 1.9em; margin-top: 1.0em;
padding-top: 1.9em !important; padding-top: 1.0em !important;
} }
/* Add some white space to the right. /* Add some white space to the right.
(This is because the actual start of the content on the left side is offset if we include the bullets and spacing.) */ (This is because the actual start of the content on the left side is offset if we include the bullets and spacing.) */
@ -353,7 +353,7 @@ html[data-theme="light"] .search-results-wrap a .rounded.border {
padding: 0.3em 0; padding: 0.3em 0;
} }
.ls-block[level="1"] { .ls-block[level="1"] {
padding-top: 0.6em; padding-top: 0.3em;
} }
.block-children { .block-children {
padding: 0.16em 0; padding: 0.16em 0;
@ -655,8 +655,8 @@ html[data-theme="light"] .cm-s-solarized.cm-s-dark .CodeMirror-gutters {
/* { == 4. Plugin specific ==> */ /* { == 4. Plugin specific ==> */
/* {{ 4.1. Tabs Plugin */ /* {{ 4.1. Tabs Plugin */
#main-content-container { #main-content-container {
margin-top: 1.9em; margin-top: 1.0em;
padding-top: 1.9em !important; padding-top: 1.0em !important;
} }
html[data-theme="dark"] #logseq-tabs_lsp_main { html[data-theme="dark"] #logseq-tabs_lsp_main {
filter: sepia(0) saturate(0.8) opacity(0.85) hue-rotate(360deg) grayscale(0.05) brightness(0.85) invert(0.04); filter: sepia(0) saturate(0.8) opacity(0.85) hue-rotate(360deg) grayscale(0.05) brightness(0.85) invert(0.04);

115
pages/hls__HTMFS_Strong_Consistency_Comes_for_Free_with_1682647018871_0.md
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@ -124,4 +124,117 @@ file-path:: ../assets/HTMFS_Strong_Consistency_Comes_for_Free_with_1682647018871
- 非常自然的想法：把一个操作，或者说trx，拆成小的 - 非常自然的想法：把一个操作，或者说trx，拆成小的
- 三种操作分类： - 三种操作分类：
- Read、Invisible write(内部的东西，比如块分配信息) 、Visible write(应用程序可见的) - Read、Invisible write(内部的东西，比如块分配信息) 、Visible write(应用程序可见的)
- 只有 Visible Write 用 HTM 实现，Invisible 和 Read 通过别的机制来实现 - 只有 Visible Write 用 HTM 实现，Invisible 和 Read 通过别的机制来实现
- （对于一整个FS操作）首先在 RTM 外面完成所需的 read 和 invisible，然后用 RTM 完成 visible，保证它们是 atomic 的。
hl-page:: 5
ls-type:: annotation
id:: 64533b91-7e2b-448b-bb4f-807cc7cb5a77
hl-color:: yellow
- RTM外面的部分不保证并发安全，用 sequence count 来解决这个问题。
hl-page:: 5
ls-type:: annotation
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- 这东西的原型是 Linux 里面的 `seqlock` 。基本原理可以看这个。 [SeqLock中文博客](http://www.wowotech.net/kernel_synchronization/seqlock.html)。 然后这里的机制大概就是把 writer lock 给换成了 RTM，虽然细节上不是很一样
- 在读之前（RTM外）先记录 seqcount，然后进入 RTM 之后进行验证，需要保证在 RTM commit 之前这些 seqcount 都没变。如果有变化，就需要重新回到 RTM 外面的某一点重新读取
- 当然如果是 accidental abort，那么只需要重新执行RTM就可以了（就算前面读的数据炸了，反正还是要验证一次的）
- 不过有个问题它没说，就是 invisible write，它没有RTM保证不会写冲突啊？不过也有可能，它会保证 invisible 不涉及临界区？？
- Discussion of concurrency correctness.
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- Read-Read显然不冲突
- Write-Write 他说potential conflicting write 会被RTM保护起来，不过有可能会live lock掉
- Write-Read 也就是如果在RTM里面写入并且commit之前读取，会导致RTM abort
- Read-Write 的情况就比较复杂了。作者给了个图，考虑了 T1 读，同时有T2写的例子
- T2 在 T1 验证之前写：Valid fail 然后重新读。不过其实是有一个 overlap 的，图里面的第三个B点应该也会 RTM-abort
- T2 在 T1 验证之后、RTM commit 之前写：因为读取的数据在 RTM 的 read-set 里面，所有还是会 RTM abort
- 3.2 File Operations
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- 其实看 Figure 3 就行了
- 3.2.1 Data Read
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- 前面也写了，用 seqcnt 机制来保证读一致性。众所周知，每个文件的inode里面都有block指针，这里给每个指针都配上了一个seqno，读的时候就用这些个东西
- 3.2.2 Data Write
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- convert data updates to metadata updates that can be embedded in the RTM transactions.
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- small writes，直接塞进RTM
hl-page:: 6
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- 大量写入，先把数据写入PM，然后再更新元数据。这时候用的就是block指针了。具体：空间分配是用的DRAM数据；（存疑？然后 shadow page 写文件数据）；最后 RTM 修改 FS 元数据，allocation 的修改这个时候才会被持久化。如果 trx 提交之前炸了，顶多就是写了点垃圾数据到空白位置罢了。
- But the blocks may have leaked after a system crash. 没看懂，为啥会leak啊？你的 alloc 数据又没落盘。
hl-stamp:: 1683184901505
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- 不过看上去，它们这边是认为分配一个块是个双向的过程，不仅会在总的freelist里面有记录，block 里面也有一个记录表明它的分配情况？
- 3.2.3 Allocation
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- 首先把已经分配的块放进一个 temporal allocating list 里面 （大概会在 alloc 阶段持久化？），如果commit成功就不管它，如果出事了就把这个里面的块还回去
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- 在释放块的时候，也会存在中途 crash 的问题。一般是先删掉reference 然后再释放块，如果没释放完，那这个块就leak了。还是有和前面类似的疑问，这东西不是 引用一删就已经整完了吗？
- the file system crashes after a reference to a block of data has been removed (when this block of memory has not yet been freed)
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- 3.3 Directory Operations
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- 3.3.1 Path Walk
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- 3.3.2 Directory Updates
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- 3.4 Other File Types
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- 就写了一个 symlink，但是这玩意就是其他操作的组合罢了，没啥特别的东西
- 3.5 The Timestamps
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- 3.6 The Special Case: Rename
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- 4 Implementation
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