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When OOM Killer or kernel reports memory state it uses the next abbreviations

Node 0 DMA: 26*4kB (M) 53*8kB (UM) 33*16kB (ME) 23*32kB (UME) 6*64kB (ME) 7*128kB (UME) 1*256kB (M) 2*512kB (ME) 0*1024kB 0*2048kB 0*4096kB = 4352kB
Node 0 DMA32: 803*4kB (UME) 3701*8kB (UMEH) 830*16kB (UMH) 2*32kB (H) 0*64kB 0*128kB 1*256kB (H) 0*512kB 0*1024kB 0*2048kB 0*4096kB = 46420kB

I understand some of them, for example M - movable UMH - unmovable high. But I can not find what means E Where I can find documentation about it?

For example I have the next message,

page allocation stalls for 27840ms, order:0, mode:0x14200ca(GFP_HIGHUSER_MOVABLE)

what means process requests 4kb page (2^0 * 4kb), that should be coded as (MH) Am I right? Or HIGHUSER is coded in different way?

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