Date: Sat, 22 Jun 2024 19:12:30 +1200
From: Barry Song <21cnbao@...il.com>
To: akpm@...ux-foundation.org,
	chrisl@...nel.org,
	linux-mm@...ck.org,
	ryan.roberts@....com
Cc: david@...hat.com,
	hughd@...gle.com,
	kaleshsingh@...gle.com,
	kasong@...cent.com,
	linux-kernel@...r.kernel.org,
	v-songbaohua@...o.com,
	ying.huang@...el.com
Subject: [PATCH v2 0/1] tools/mm: Introduce a tool to assess swap entry allocation for thp_swapout

From: Barry Song <v-songbaohua@...o.com>

-v2:
 * add swap-in which can either be aligned or not aligned, by "-a";
   Ying;
 * move the program to tools/mm; Ryan;
 * try to simulate the scenarios swap is full. Chris;

-v1:
 https://lore.kernel.org/linux-mm/20240620002648.75204-1-21cnbao@gmail.com/

I tested Ryan's RFC patchset[1] and Chris's v3[2] using this v2 tool:
[1] https://lore.kernel.org/linux-mm/20240618232648.4090299-1-ryan.roberts@arm.com/ 
[2] https://lore.kernel.org/linux-mm/20240614-swap-allocator-v2-0-2a513b4a7f2f@kernel.org/

Obviously, we're rarely hitting 100% even in the worst case without "-a" and with
"-s," which is good news!
If swapin is aligned w/ "-a" and w/o "-s", both Chris's and Ryan's patches show
a low fallback ratio though Chris's has the numbers above 0% but Ryan's are 0%
(value A).

The bad news is that unaligned swapin can significantly increase the fallback ratio,
reaching up to 85% for Ryan's patch and 95% for Chris's patchset without "-s." Both
approaches approach 100% without "-a" and with "-s" (value B).

I believe real workloads should yield a value between A and B. Without "-a," and
lacking large folios swap-in, this tool randomly swaps in small folios without
considering spatial locality, which is a factor present in real workloads. This
typically results in values higher than A and lower than B.

Based on the below results, I believe that:
1. We truly require large folio swap-in to achieve comparable results with
aligned swap-in(based on the result w/o and w/ "-a")
2. We need a method to prevent small folios from scattering indiscriminately
(based on the result "-a -s")

*
*  Test results on Ryan's patchset:
*

1. w/ -a
./thp_swap_allocator_test -a
Iteration 1: swpout inc: 224, swpout fallback inc: 0, Fallback percentage: 0.00%
Iteration 2: swpout inc: 231, swpout fallback inc: 0, Fallback percentage: 0.00%
Iteration 3: swpout inc: 227, swpout fallback inc: 0, Fallback percentage: 0.00%
Iteration 4: swpout inc: 222, swpout fallback inc: 0, Fallback percentage: 0.00%
...
Iteration 100: swpout inc: 228, swpout fallback inc: 0, Fallback percentage: 0.00%

2. w/o -a
./thp_swap_allocator_test

Iteration 1: swpout inc: 208, swpout fallback inc: 25, Fallback percentage: 10.73%
Iteration 2: swpout inc: 118, swpout fallback inc: 114, Fallback percentage: 49.14%
Iteration 3: swpout inc: 63, swpout fallback inc: 163, Fallback percentage: 72.12%
Iteration 4: swpout inc: 45, swpout fallback inc: 178, Fallback percentage: 79.82%
Iteration 5: swpout inc: 42, swpout fallback inc: 184, Fallback percentage: 81.42%
Iteration 6: swpout inc: 31, swpout fallback inc: 193, Fallback percentage: 86.16%
Iteration 7: swpout inc: 27, swpout fallback inc: 201, Fallback percentage: 88.16%
Iteration 8: swpout inc: 30, swpout fallback inc: 198, Fallback percentage: 86.84%
Iteration 9: swpout inc: 32, swpout fallback inc: 194, Fallback percentage: 85.84%
...
Iteration 91: swpout inc: 26, swpout fallback inc: 194, Fallback percentage: 88.18%
Iteration 92: swpout inc: 35, swpout fallback inc: 196, Fallback percentage: 84.85%
Iteration 93: swpout inc: 33, swpout fallback inc: 191, Fallback percentage: 85.27%
Iteration 94: swpout inc: 26, swpout fallback inc: 193, Fallback percentage: 88.13%
Iteration 95: swpout inc: 39, swpout fallback inc: 189, Fallback percentage: 82.89%
Iteration 96: swpout inc: 28, swpout fallback inc: 196, Fallback percentage: 87.50%
Iteration 97: swpout inc: 25, swpout fallback inc: 194, Fallback percentage: 88.58%
Iteration 98: swpout inc: 31, swpout fallback inc: 196, Fallback percentage: 86.34%
Iteration 99: swpout inc: 32, swpout fallback inc: 202, Fallback percentage: 86.32%
Iteration 100: swpout inc: 33, swpout fallback inc: 195, Fallback percentage: 85.53%

3. w/ -a and -s
./thp_swap_allocator_test -a -s
Iteration 1: swpout inc: 224, swpout fallback inc: 0, Fallback percentage: 0.00%
Iteration 2: swpout inc: 218, swpout fallback inc: 0, Fallback percentage: 0.00%
Iteration 3: swpout inc: 222, swpout fallback inc: 0, Fallback percentage: 0.00%
Iteration 4: swpout inc: 220, swpout fallback inc: 6, Fallback percentage: 2.65%
Iteration 5: swpout inc: 206, swpout fallback inc: 16, Fallback percentage: 7.21%
Iteration 6: swpout inc: 233, swpout fallback inc: 0, Fallback percentage: 0.00%
Iteration 7: swpout inc: 224, swpout fallback inc: 0, Fallback percentage: 0.00%
Iteration 8: swpout inc: 228, swpout fallback inc: 0, Fallback percentage: 0.00%
Iteration 9: swpout inc: 217, swpout fallback inc: 0, Fallback percentage: 0.00%
Iteration 10: swpout inc: 224, swpout fallback inc: 3, Fallback percentage: 1.32%
Iteration 11: swpout inc: 211, swpout fallback inc: 12, Fallback percentage: 5.38%
Iteration 12: swpout inc: 200, swpout fallback inc: 32, Fallback percentage: 13.79%
Iteration 13: swpout inc: 189, swpout fallback inc: 29, Fallback percentage: 13.30%
Iteration 14: swpout inc: 195, swpout fallback inc: 31, Fallback percentage: 13.72%
Iteration 15: swpout inc: 198, swpout fallback inc: 27, Fallback percentage: 12.00%
Iteration 16: swpout inc: 201, swpout fallback inc: 17, Fallback percentage: 7.80%
Iteration 17: swpout inc: 206, swpout fallback inc: 6, Fallback percentage: 2.83%
Iteration 18: swpout inc: 220, swpout fallback inc: 14, Fallback percentage: 5.98%
Iteration 19: swpout inc: 181, swpout fallback inc: 45, Fallback percentage: 19.91%
Iteration 20: swpout inc: 223, swpout fallback inc: 8, Fallback percentage: 3.46%
Iteration 21: swpout inc: 214, swpout fallback inc: 14, Fallback percentage: 6.14%
Iteration 22: swpout inc: 195, swpout fallback inc: 31, Fallback percentage: 13.72%
Iteration 23: swpout inc: 223, swpout fallback inc: 0, Fallback percentage: 0.00%
Iteration 24: swpout inc: 233, swpout fallback inc: 0, Fallback percentage: 0.00%
Iteration 25: swpout inc: 214, swpout fallback inc: 1, Fallback percentage: 0.47%
Iteration 26: swpout inc: 229, swpout fallback inc: 1, Fallback percentage: 0.43%
Iteration 27: swpout inc: 214, swpout fallback inc: 5, Fallback percentage: 2.28%
Iteration 28: swpout inc: 211, swpout fallback inc: 15, Fallback percentage: 6.64%
Iteration 29: swpout inc: 188, swpout fallback inc: 40, Fallback percentage: 17.54%
Iteration 30: swpout inc: 207, swpout fallback inc: 18, Fallback percentage: 8.00%
Iteration 31: swpout inc: 215, swpout fallback inc: 10, Fallback percentage: 4.44%
Iteration 32: swpout inc: 202, swpout fallback inc: 22, Fallback percentage: 9.82%
Iteration 33: swpout inc: 223, swpout fallback inc: 0, Fallback percentage: 0.00%
Iteration 34: swpout inc: 218, swpout fallback inc: 10, Fallback percentage: 4.39%
Iteration 35: swpout inc: 203, swpout fallback inc: 30, Fallback percentage: 12.88%
Iteration 36: swpout inc: 214, swpout fallback inc: 14, Fallback percentage: 6.14%
Iteration 37: swpout inc: 211, swpout fallback inc: 14, Fallback percentage: 6.22%
Iteration 38: swpout inc: 193, swpout fallback inc: 28, Fallback percentage: 12.67%
Iteration 39: swpout inc: 210, swpout fallback inc: 20, Fallback percentage: 8.70%
Iteration 40: swpout inc: 223, swpout fallback inc: 5, Fallback percentage: 2.19%
Iteration 41: swpout inc: 224, swpout fallback inc: 7, Fallback percentage: 3.03%
Iteration 42: swpout inc: 200, swpout fallback inc: 23, Fallback percentage: 10.31%
Iteration 43: swpout inc: 217, swpout fallback inc: 5, Fallback percentage: 2.25%
Iteration 44: swpout inc: 206, swpout fallback inc: 18, Fallback percentage: 8.04%
Iteration 45: swpout inc: 210, swpout fallback inc: 11, Fallback percentage: 4.98%
Iteration 46: swpout inc: 204, swpout fallback inc: 19, Fallback percentage: 8.52%
Iteration 47: swpout inc: 228, swpout fallback inc: 0, Fallback percentage: 0.00%
Iteration 48: swpout inc: 219, swpout fallback inc: 2, Fallback percentage: 0.90%
Iteration 49: swpout inc: 212, swpout fallback inc: 6, Fallback percentage: 2.75%
Iteration 50: swpout inc: 207, swpout fallback inc: 15, Fallback percentage: 6.76%
Iteration 51: swpout inc: 190, swpout fallback inc: 36, Fallback percentage: 15.93%
Iteration 52: swpout inc: 212, swpout fallback inc: 17, Fallback percentage: 7.42%
Iteration 53: swpout inc: 179, swpout fallback inc: 43, Fallback percentage: 19.37%
Iteration 54: swpout inc: 225, swpout fallback inc: 0, Fallback percentage: 0.00%
Iteration 55: swpout inc: 224, swpout fallback inc: 2, Fallback percentage: 0.88%
Iteration 56: swpout inc: 220, swpout fallback inc: 8, Fallback percentage: 3.51%
Iteration 57: swpout inc: 203, swpout fallback inc: 25, Fallback percentage: 10.96%
Iteration 58: swpout inc: 213, swpout fallback inc: 6, Fallback percentage: 2.74%
Iteration 59: swpout inc: 207, swpout fallback inc: 18, Fallback percentage: 8.00%
Iteration 60: swpout inc: 216, swpout fallback inc: 14, Fallback percentage: 6.09%
Iteration 61: swpout inc: 183, swpout fallback inc: 34, Fallback percentage: 15.67%
Iteration 62: swpout inc: 184, swpout fallback inc: 39, Fallback percentage: 17.49%
Iteration 63: swpout inc: 184, swpout fallback inc: 39, Fallback percentage: 17.49%
Iteration 64: swpout inc: 210, swpout fallback inc: 15, Fallback percentage: 6.67%
Iteration 65: swpout inc: 178, swpout fallback inc: 48, Fallback percentage: 21.24%
Iteration 66: swpout inc: 188, swpout fallback inc: 30, Fallback percentage: 13.76%
Iteration 67: swpout inc: 193, swpout fallback inc: 29, Fallback percentage: 13.06%
Iteration 68: swpout inc: 202, swpout fallback inc: 22, Fallback percentage: 9.82%
Iteration 69: swpout inc: 213, swpout fallback inc: 5, Fallback percentage: 2.29%
Iteration 70: swpout inc: 204, swpout fallback inc: 15, Fallback percentage: 6.85%
Iteration 71: swpout inc: 180, swpout fallback inc: 45, Fallback percentage: 20.00%
Iteration 72: swpout inc: 210, swpout fallback inc: 21, Fallback percentage: 9.09%
Iteration 73: swpout inc: 216, swpout fallback inc: 7, Fallback percentage: 3.14%
Iteration 74: swpout inc: 209, swpout fallback inc: 19, Fallback percentage: 8.33%
Iteration 75: swpout inc: 222, swpout fallback inc: 7, Fallback percentage: 3.06%
Iteration 76: swpout inc: 212, swpout fallback inc: 14, Fallback percentage: 6.19%
Iteration 77: swpout inc: 188, swpout fallback inc: 41, Fallback percentage: 17.90%
Iteration 78: swpout inc: 198, swpout fallback inc: 17, Fallback percentage: 7.91%
Iteration 79: swpout inc: 209, swpout fallback inc: 16, Fallback percentage: 7.11%
Iteration 80: swpout inc: 182, swpout fallback inc: 41, Fallback percentage: 18.39%
Iteration 81: swpout inc: 217, swpout fallback inc: 1, Fallback percentage: 0.46%
Iteration 82: swpout inc: 225, swpout fallback inc: 3, Fallback percentage: 1.32%
Iteration 83: swpout inc: 222, swpout fallback inc: 8, Fallback percentage: 3.48%
Iteration 84: swpout inc: 201, swpout fallback inc: 21, Fallback percentage: 9.46%
Iteration 85: swpout inc: 211, swpout fallback inc: 3, Fallback percentage: 1.40%
Iteration 86: swpout inc: 209, swpout fallback inc: 14, Fallback percentage: 6.28%
Iteration 87: swpout inc: 181, swpout fallback inc: 42, Fallback percentage: 18.83%
Iteration 88: swpout inc: 223, swpout fallback inc: 4, Fallback percentage: 1.76%
Iteration 89: swpout inc: 214, swpout fallback inc: 14, Fallback percentage: 6.14%
Iteration 90: swpout inc: 192, swpout fallback inc: 33, Fallback percentage: 14.67%
Iteration 91: swpout inc: 184, swpout fallback inc: 31, Fallback percentage: 14.42%
Iteration 92: swpout inc: 201, swpout fallback inc: 32, Fallback percentage: 13.73%
Iteration 93: swpout inc: 181, swpout fallback inc: 40, Fallback percentage: 18.10%
Iteration 94: swpout inc: 211, swpout fallback inc: 14, Fallback percentage: 6.22%
Iteration 95: swpout inc: 198, swpout fallback inc: 25, Fallback percentage: 11.21%
Iteration 96: swpout inc: 205, swpout fallback inc: 22, Fallback percentage: 9.69%
Iteration 97: swpout inc: 218, swpout fallback inc: 12, Fallback percentage: 5.22%
Iteration 98: swpout inc: 203, swpout fallback inc: 25, Fallback percentage: 10.96%
Iteration 99: swpout inc: 218, swpout fallback inc: 12, Fallback percentage: 5.22%
Iteration 100: swpout inc: 195, swpout fallback inc: 34, Fallback percentage: 14.85%

4. w/o -a and w/ -s
thp_swap_allocator_test  -s
Iteration 1: swpout inc: 173, swpout fallback inc: 60, Fallback percentage: 25.75%
Iteration 2: swpout inc: 85, swpout fallback inc: 147, Fallback percentage: 63.36%
Iteration 3: swpout inc: 39, swpout fallback inc: 195, Fallback percentage: 83.33%
Iteration 4: swpout inc: 13, swpout fallback inc: 220, Fallback percentage: 94.42%
Iteration 5: swpout inc: 10, swpout fallback inc: 215, Fallback percentage: 95.56%
Iteration 6: swpout inc: 9, swpout fallback inc: 219, Fallback percentage: 96.05%
Iteration 7: swpout inc: 6, swpout fallback inc: 217, Fallback percentage: 97.31%
Iteration 8: swpout inc: 6, swpout fallback inc: 215, Fallback percentage: 97.29%
Iteration 9: swpout inc: 0, swpout fallback inc: 225, Fallback percentage: 100.00%
Iteration 10: swpout inc: 1, swpout fallback inc: 229, Fallback percentage: 99.57%
Iteration 11: swpout inc: 2, swpout fallback inc: 216, Fallback percentage: 99.08%
Iteration 12: swpout inc: 2, swpout fallback inc: 229, Fallback percentage: 99.13%
Iteration 13: swpout inc: 4, swpout fallback inc: 211, Fallback percentage: 98.14%
Iteration 14: swpout inc: 1, swpout fallback inc: 221, Fallback percentage: 99.55%
Iteration 15: swpout inc: 2, swpout fallback inc: 223, Fallback percentage: 99.11%
Iteration 16: swpout inc: 3, swpout fallback inc: 224, Fallback percentage: 98.68%
Iteration 17: swpout inc: 2, swpout fallback inc: 231, Fallback percentage: 99.14%
...

*
*  Test results on Chris's v3 patchset:
*
1. w/ -a
./thp_swap_allocator_test -a
Iteration 1: swpout inc: 224, swpout fallback inc: 0, Fallback percentage: 0.00%
Iteration 2: swpout inc: 231, swpout fallback inc: 0, Fallback percentage: 0.00%
Iteration 3: swpout inc: 227, swpout fallback inc: 0, Fallback percentage: 0.00%
Iteration 4: swpout inc: 217, swpout fallback inc: 5, Fallback percentage: 2.25%
Iteration 5: swpout inc: 215, swpout fallback inc: 12, Fallback percentage: 5.29%
Iteration 6: swpout inc: 213, swpout fallback inc: 14, Fallback percentage: 6.17%
Iteration 7: swpout inc: 207, swpout fallback inc: 15, Fallback percentage: 6.76%
Iteration 8: swpout inc: 193, swpout fallback inc: 33, Fallback percentage: 14.60%
Iteration 9: swpout inc: 214, swpout fallback inc: 13, Fallback percentage: 5.73%
Iteration 10: swpout inc: 199, swpout fallback inc: 25, Fallback percentage: 11.16%
Iteration 11: swpout inc: 208, swpout fallback inc: 14, Fallback percentage: 6.31%
Iteration 12: swpout inc: 203, swpout fallback inc: 31, Fallback percentage: 13.25%
Iteration 13: swpout inc: 192, swpout fallback inc: 25, Fallback percentage: 11.52%
Iteration 14: swpout inc: 193, swpout fallback inc: 36, Fallback percentage: 15.72%
Iteration 15: swpout inc: 188, swpout fallback inc: 33, Fallback percentage: 14.93%
...

It seems Chris's approach can be negatively affected even by aligned swapin,
having a low fallback ratio but not 0% while Ryan's patchset hasn't this
issue.

2. w/o -a
./thp_swap_allocator_test
Iteration 1: swpout inc: 209, swpout fallback inc: 24, Fallback percentage: 10.30%
Iteration 2: swpout inc: 100, swpout fallback inc: 132, Fallback percentage: 56.90%
Iteration 3: swpout inc: 43, swpout fallback inc: 183, Fallback percentage: 80.97%
Iteration 4: swpout inc: 30, swpout fallback inc: 193, Fallback percentage: 86.55%
Iteration 5: swpout inc: 21, swpout fallback inc: 205, Fallback percentage: 90.71%
Iteration 6: swpout inc: 10, swpout fallback inc: 214, Fallback percentage: 95.54%
Iteration 7: swpout inc: 16, swpout fallback inc: 212, Fallback percentage: 92.98%
Iteration 8: swpout inc: 9, swpout fallback inc: 219, Fallback percentage: 96.05%
Iteration 9: swpout inc: 6, swpout fallback inc: 220, Fallback percentage: 97.35%
Iteration 10: swpout inc: 7, swpout fallback inc: 221, Fallback percentage: 96.93%
Iteration 11: swpout inc: 7, swpout fallback inc: 222, Fallback percentage: 96.94%
Iteration 12: swpout inc: 8, swpout fallback inc: 212, Fallback percentage: 96.36%
..

Ryan's fallback ratio(around 85%) seems to be a little better while both are much
worse than "-a".

3. w/ -a and -s
./thp_swap_allocator_test -a -s
Iteration 1: swpout inc: 224, swpout fallback inc: 0, Fallback percentage: 0.00%
Iteration 2: swpout inc: 213, swpout fallback inc: 5, Fallback percentage: 2.29%
Iteration 3: swpout inc: 215, swpout fallback inc: 7, Fallback percentage: 3.15%
Iteration 4: swpout inc: 210, swpout fallback inc: 16, Fallback percentage: 7.08%
Iteration 5: swpout inc: 212, swpout fallback inc: 10, Fallback percentage: 4.50%
Iteration 6: swpout inc: 215, swpout fallback inc: 18, Fallback percentage: 7.73%
Iteration 7: swpout inc: 181, swpout fallback inc: 43, Fallback percentage: 19.20%
Iteration 8: swpout inc: 173, swpout fallback inc: 55, Fallback percentage: 24.12%
Iteration 9: swpout inc: 163, swpout fallback inc: 54, Fallback percentage: 24.88%
Iteration 10: swpout inc: 168, swpout fallback inc: 59, Fallback percentage: 25.99%
Iteration 11: swpout inc: 154, swpout fallback inc: 69, Fallback percentage: 30.94%
Iteration 12: swpout inc: 166, swpout fallback inc: 66, Fallback percentage: 28.45%
Iteration 13: swpout inc: 165, swpout fallback inc: 53, Fallback percentage: 24.31%
Iteration 14: swpout inc: 158, swpout fallback inc: 68, Fallback percentage: 30.09%
Iteration 15: swpout inc: 168, swpout fallback inc: 57, Fallback percentage: 25.33%
Iteration 16: swpout inc: 165, swpout fallback inc: 53, Fallback percentage: 24.31%
Iteration 17: swpout inc: 163, swpout fallback inc: 49, Fallback percentage: 23.11%
Iteration 18: swpout inc: 172, swpout fallback inc: 62, Fallback percentage: 26.50%
Iteration 19: swpout inc: 183, swpout fallback inc: 43, Fallback percentage: 19.03%
Iteration 20: swpout inc: 158, swpout fallback inc: 73, Fallback percentage: 31.60%
Iteration 21: swpout inc: 147, swpout fallback inc: 81, Fallback percentage: 35.53%
Iteration 22: swpout inc: 140, swpout fallback inc: 86, Fallback percentage: 38.05%
Iteration 23: swpout inc: 144, swpout fallback inc: 79, Fallback percentage: 35.43%
Iteration 24: swpout inc: 132, swpout fallback inc: 101, Fallback percentage: 43.35%
Iteration 25: swpout inc: 133, swpout fallback inc: 82, Fallback percentage: 38.14%
Iteration 26: swpout inc: 152, swpout fallback inc: 78, Fallback percentage: 33.91%
Iteration 27: swpout inc: 138, swpout fallback inc: 81, Fallback percentage: 36.99%
Iteration 28: swpout inc: 152, swpout fallback inc: 74, Fallback percentage: 32.74%
Iteration 29: swpout inc: 153, swpout fallback inc: 75, Fallback percentage: 32.89%
Iteration 30: swpout inc: 151, swpout fallback inc: 74, Fallback percentage: 32.89%
...

Chris's approach appears to be more susceptible to negative effects from
small folios.

4. w/o -a and w/ -s
./thp_swap_allocator_test -s
Iteration 1: swpout inc: 183, swpout fallback inc: 50, Fallback percentage: 21.46%
Iteration 2: swpout inc: 75, swpout fallback inc: 157, Fallback percentage: 67.67%
Iteration 3: swpout inc: 33, swpout fallback inc: 201, Fallback percentage: 85.90%
Iteration 4: swpout inc: 11, swpout fallback inc: 222, Fallback percentage: 95.28%
Iteration 5: swpout inc: 10, swpout fallback inc: 215, Fallback percentage: 95.56%
Iteration 6: swpout inc: 7, swpout fallback inc: 221, Fallback percentage: 96.93%
Iteration 7: swpout inc: 2, swpout fallback inc: 221, Fallback percentage: 99.10%
Iteration 8: swpout inc: 4, swpout fallback inc: 217, Fallback percentage: 98.19%
Iteration 9: swpout inc: 0, swpout fallback inc: 225, Fallback percentage: 100.00%
Iteration 10: swpout inc: 3, swpout fallback inc: 227, Fallback percentage: 98.70%
Iteration 11: swpout inc: 1, swpout fallback inc: 217, Fallback percentage: 99.54%
Iteration 12: swpout inc: 2, swpout fallback inc: 229, Fallback percentage: 99.13%
Iteration 13: swpout inc: 1, swpout fallback inc: 214, Fallback percentage: 99.53%
Iteration 14: swpout inc: 2, swpout fallback inc: 220, Fallback percentage: 99.10%
Iteration 15: swpout inc: 1, swpout fallback inc: 224, Fallback percentage: 99.56%
Iteration 16: swpout inc: 3, swpout fallback inc: 224, Fallback percentage: 98.68%
...

Barry Song (1):
  tools/mm: Introduce a tool to assess swap entry allocation for
    thp_swapout

 tools/mm/Makefile                  |   2 +-
 tools/mm/thp_swap_allocator_test.c | 233 +++++++++++++++++++++++++++++
 2 files changed, 234 insertions(+), 1 deletion(-)
 create mode 100644 tools/mm/thp_swap_allocator_test.c

-- 
2.34.1

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