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proc/sys/vm:
.
value                       param          desc
.
block_dump                  [1/0]          Identify processes performing
                                           reads/writes
.
dirty_background_ratio        %
dirty_ratio                   %
dirty_expire_centisecs      1/100th sec    age before eligible for writeout
dirty_writeback_centisecs   1/100th sec    wake up interval for pdflush
.
laptop_mode                 [1/0]          Laptop mode patch[4]
.
lower_zone_protection       ~= MB          protect low memory
.
max_map_count               # of pages     VM areas a process is allowed to
                                           have (* page size)
.
min_free_kbytes             # KiB          Reserved for interrupt memory
                                           allocation attempts [1]
.
nr_pdflush_threads          #              pdflush daemons running
.
overcommit_memory           [2/1/0]        always allow malloc() success
overcommit_ratio            See Documentation/vm/overcommit-accounting
.
page-cluster                #              logarithmic, pages (4KiB/ia32)
                                           written to swap per attempt
swappiness                  # [0-100]      See URLs [2][3]
 

[1]
[2]
[3] (2/3 down, post by Mr Z)
[4]