Move mobile specific CPUCachingAllocator to c10/mobile folder.

[kimishpatel]

Summary: Plus add some more comments about the usage, limitations and cons.

Test Plan: Build and run benchmark binary.

Differential Revision: D23944193

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D23944193

[dr-ci]

💊 CI failures summary and remediations

As of commit e81b8a8 (more details on the Dr. CI page):

---

• 1/3 failures possibly* introduced in this PR
  • 1/1 non-CircleCI failure(s)
• 1/3 tentatively recognized as flaky ❄️
  • Click here to rerun these jobs
• 1/3 broken upstream at merge base 7cde662 on Sep 29 from 7:36am to 8:34am PDT (1 commit; 7cde662 - 6d37126)

---

❄️ 1 failure tentatively classified as flaky

but reruns have not yet been triggered to confirm:

pytorch_ios_11_2_1_x86_64_build (1/1)

Step: "Update Homebrew" (full log | diagnosis details | 🔁 rerun) ❄️

fatal: Could not read from remote repository.

Receiving objects:  98% (175/178) Receiving objects:  99% (177/178) Receiving objects: 100% (178/178) Receiving objects: 100% (178/178), 63.88 KiB | 10.65 MiB/s, done. 
Resolving deltas:  96% (89/92) Resolving deltas:  97% (90/92) Resolving deltas: 100% (92/92) Resolving deltas: 100% (92/92), completed with 85 local objects. 
From ssh://github.com/Homebrew/homebrew-cask-versions 
 + 15f6b44...92646be master     -> origin/master  (forced update) 
+ git reset --hard origin/master 
HEAD is now at 92646be Update dropbox-beta from 107.3.412 to 107.3.416 (#9683) 
+ for path in '$(find /usr/local/Homebrew -type d -name .git)' 
+ cd /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core/.git/.. 
+ git fetch --depth=1 origin 
Connection to github.com closed by remote host.  
fatal: Could not read from remote repository. 
 
Please make sure you have the correct access rights 
and the repository exists. 

---

🚧 1 fixed upstream failure:

These were probably caused by upstream breakages that were already fixed.

Please rebase on the viable/strict branch (expand for instructions)

If your commit is newer than viable/strict, you can try basing on an older, stable commit:

git fetch https://github.com/pytorch/pytorch viable/strict
git rebase --onto FETCH_HEAD $(git merge-base origin/master HEAD)

If your commit is older than viable/strict:

git fetch https://github.com/pytorch/pytorch viable/strict
git rebase FETCH_HEAD

Check out the recency history of this "viable master" tracking branch.

• pytorch_macos_10_13_py3_build on Sep 29 from 7:36am to 8:34am PDT (1 commit; 7cde662 - 6d37126)
  • 🔁 rerun

---

ci.pytorch.org: 1 failed

• Failed: pr/pytorch-linux-bionic-rocm3.7-py3.6

---

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[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D23944193

[codecov]

Codecov Report

Merging #45364 into master will increase coverage by 0.22%.
The diff coverage is 79.78%.

@@            Coverage Diff             @@
##           master   #45364      +/-   ##
==========================================
+ Coverage   68.15%   68.38%   +0.22%     
==========================================
  Files         396      405       +9     
  Lines       51133    51765     +632     
==========================================
+ Hits        34851    35399     +548     
- Misses      16282    16366      +84     

Impacted Files	Coverage Δ
torch/distributed/__init__.py	87.50% <ø> (ø)
torch/functional.py	88.21% <ø> (-0.08%)	⬇️
torch/onnx/symbolic_opset10.py	36.25% <0.00%> (ø)
torch/testing/_internal/common_nn.py	83.50% <0.00%> (+0.16%)	⬆️
torch/_lobpcg.py	69.50% <16.66%> (-16.84%)	⬇️
torch/onnx/symbolic_opset9.py	35.47% <22.22%> (+0.68%)	⬆️
...orch/testing/_internal/codegen/random_topo_test.py	10.04% <50.00%> (+0.41%)	⬆️
torch/onnx/symbolic_helper.py	42.76% <60.00%> (-0.10%)	⬇️
torch/optim/_multi_tensor/sgd.py	90.27% <90.27%> (ø)
torch/optim/_multi_tensor/adamax.py	91.37% <91.37%> (ø)
... and 26 more

---

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[gchanan]

nit: did you mean: "It has been observed that some mobile platforms, such as pixel 3", return ..."

[gchanan]

nit: can you put a brief summary of the disclaimer first, like:

`DISCLAIMER: this is subject to change (beta) and only supported on mobile builds. See below for more information"

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D23944193

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D23944193

[facebook-github-bot]

This pull request has been merged in 6e55a26.

[facebook-github-bot]

This pull request has been merged in 6e55a26.